|  Filed                Pursuant to Rule 424(b)(3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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|  Registration                  No. 333-124310                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| PRICING                  SUPPLEMENT NO. 423                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Dated                  December 5, 2007 to                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| PROSPECTUS                  SUPPLEMENT                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |   |   |   |   |   |   |
| Dated                  June 8, 2005 and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |   |   |
| PROSPECTUS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |   |   |   |   |   |   |   |
| Dated                  May 13, 2005                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| CATERPILLAR                  FINANCIAL SERVICES CORPORATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| MEDIUM-TERM                  NOTES, SERIES F, 4.85% NOTES DUE 2012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **SUBJECT**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | **FINAL                  PRICING DETAILS** |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Issuer:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Caterpillar                  Financial Services Corporation |   |   |   |   |   |   |   |
| Title                  of Securities:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Medium-Term                  Notes, Series F, 4.85% Notes Due 2012 |   |   |   |   |   |   |   |
| Ratings:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | A2/A |   |   |   |   |   |   |   |
| Format:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | SEC                  Registered-Registration Statement Number 333-124310 |   |   |   |   |   |   |
| Trade                  Date/Pricing Effective Time:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | December                  3, 2007 |   |   |   |   |   |   |   |
| Settlement                  Date (Original Issue date):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | December                  7, 2007 |   |   |   |   |   |   |   |
| Maturity                  Date:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | December                  7, 2012 |   |   |   |   |   |   |   |
| Principal                  Amount:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | $500,000,000 |   |   |   |   |   |   |   |
| Price                  to Public (Issue Price):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 99.947% |   |   |   |   |   |   |   |
| Dealers'                  Commission:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 0.35%                  (35 basis points) |   |   |   |   |   |   |   |
| All-in-price:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 99.597% |   |   |   |   |   |   |   |
| Net                  Proceeds to Issuer:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $497,985,000 |   |   |   |   |   |   |   |
| Coupon                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 4.850% |   |   |   |   |   |   |   |
| Yield                  to Maturity                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 4.862% |   |   |   |   |   |   |   |
| Spread                  Multiplier:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | N/A |   |   |   |   |   |   |   |
| Spread/Spread                  Multiplier Reset Option:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A |   |   |   |   |   |   |   |
| Optional                  Reset Dates (only applicable if option to reset spread or spread                  multiplier):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | N/A |   |   |   |   |   |   |   |
| Basis                  for Interest Rate Reset (only applicable if option to reset spread                  or                  spread multiplier):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A |   |   |   |   |   |   |   |
| Specified                  Currency:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | U.S.                  Dollars |   |   |   |   |   |   |   |
| Option                  to Elect Payment in U.S. Dollars  (only applicable if Specified                  Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | N/A |   |   |   |   |   |   |   |
| Authorized                  Denominations (only applicable if Specified Currency is other than                  U.S.                  Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | N/A |   |   |   |   |   |   |   |
| Historical                  Exchange Rate (only applicable if Specified Currency is other than                  U.S.                  Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | N/A |   |   |   |   |   |   |   |
| Maximum                  Interest Rate:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A |   |   |   |   |   |   |   |
| Minimum                  Interest Rate:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A |   |   |   |   |   |   |   |
| Interest                  Payment Dates:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Interest                  will be paid semi-annually on the 7th of each June and                  December |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | of                  each year, commencing June 7, 2008 and ending on the Maturity                  Date |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |   |   |   |   |   |   |   |
| Stated                  Maturity Extension Option:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A |   |   |   |   |   |   |   |
| Extension                  Period(s) and Final Maturity Date (only applicable if option to                  extend                  stated maturity):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | N/A |   |   |   |   |   |   |   |
| Basis                  for Interest Rate During Extension Period (only applicable if option                  to                  extend stated maturity):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | N/A |   |   |   |   |   |   |   |
| Original                  Issue Discount Note:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A |   |   |   |   |   |   |   |
| Total                  Amount of OID:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | N/A |   |   |   |   |   |   |   |
| Terms                  of Amortizing Notes:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | N/A |   |   |   |   |   |   |   |
| Redemption                  Date(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A |   |   |   |   |   |   |   |
| Redemption                  Price:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A |   |   |   |   |   |   |   |
| Repayment                  Date(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | N/A |   |   |   |   |   |   |   |
| Repayment                  Price(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A |   |   |   |   |   |   |   |
| Day                  Count Convention:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 30/360 |   |   |   |   |   |   |   |
| Denominations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Minimum                  denominations of $1,000 with increments of $1,000                  thereafter |   |   |   |   |
| Joint                  Lead Manager & Bookrunner                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Barclays                  Capital Inc. (35%) |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | J.P.                  Morgan Securities Inc. (35%) |   |   |   |   |   |   |   |
| Co-Managers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | Banc                  of America Securities LLC (15%) |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Citigroup                  Global Markets Inc. (15%) |   |   |   |   |   |   |   |
| Exchange                  Rate Agent:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | U.S.                  Bank Trust National Association |   |   |   |   |   |   |   |
| Calculation                  Agent:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | U.S.                  Bank Trust National Association |   |   |   |   |   |   |   |
| CUSIP:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 14912L3N9 |   |   |   |   |   |   |   |
| Other                  Terms:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | N/A |   |   |   |   |   |   |   |
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| **CAPITALIZED                  TERMS USED HEREIN WHICH ARE DEFINED IN THE PROSPECTUS SUPPLEMENT                  SHALL                  HAVE THE MEANINGS ASCRIBED THERETO IN THE PROSPECTUS SUPPLEMENT.                  THE                  INTEREST RATES ON THE NOTES MAY BE CHANGED BY CATERPILLAR FINANCIAL                  SERVICES CORPORATION FROM TIME TO TIME, BUT ANY SUCH CHANGE WILL                  NOT                  AFFECT THE INTEREST RATE ON ANY NOTES OFFERED PRIOR TO THE EFFECTIVE                  DATE                  OF THE CHANGE. AFTER THE ISSUANCE OF THE NOTES COVERED BY THIS                  PRICING                  SUPPLEMENT, $2,050MM PRINCIPAL AMOUNT OF NOTES REMAIN AVAILABLE                  FOR SALE                  PURSUANT TO THE ACCOMPANYING PROSPECTUS                  SUPPLEMENT.** |
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