Document:

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                                                                    Exhibit 4(f)

     THIS DEBT SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF. THIS DEBT SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN
THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE
LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER OF THIS DEBT
SECURITY (OTHER THAN A TRANSFER OF THIS DEBT SECURITY AS A WHOLE BY THE
DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO
THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY) MAY BE REGISTERED EXCEPT IN
SUCH LIMITED CIRCUMSTANCES. EVERY DEBT SECURITY AUTHENTICATED AND DELIVERED UPON
REGISTRATION OF TRANSFER OF, OR IN EXCHANGE FOR OR IN LIEU OF, THIS DEBT
SECURITY SHALL BE A GLOBAL SECURITY SUBJECT TO THE FOREGOING, EXCEPT IN SUCH
LIMITED CIRCUMSTANCES.

     Unless this Note is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to Olin Corporation or
its agent for registration of transfer, exchange or payment, and such Note
issued is registered in the name of Cede & Co. or in such other name as is
requested by an authorized representative of DTC and any payment is made to Cede
& Co. or to such other entity as is requested by an authorized representative of
DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL in as much as the registered owner hereof, Cede & Co.,
has an interest herein.

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No. N-1
$200,000,000
                                                           CUSIP No. 680665 AD 8

                                OLIN CORPORATION
                           9.125% Senior Note due 2011

     OLIN CORPORATION, a corporation duly organized and existing under the laws
of the Commonwealth of Virginia (herein referred to as the "Company"), for value
received, hereby promises to pay to CEDE & CO., or its registered assigns, at
the office or agency of the Company in the Borough of Manhattan, The City of New
York, the principal sum of $200,000,000 (Two Hundred Million Dollars) on
December 15, 2011, in such coin or currency of the United States of America as
at the time of payment shall be legal tender for the payment of public and
private debts, and to pay interest, semiannually on June 15 and December 15 of
each year (each, an "Interest Payment Date"), commencing June 15, 2002, at a
rate of 9.125% per annum, on said principal sum at said office or agency, in
like coin or currency, from the Interest Payment Date next preceding the date of
this Note to which interest has been paid, unless the date hereof is a date to
which interest has been paid, in which case from the date of this Note, or
unless no interest has been paid on this Note, in which case from December 11,
2001, until payment of said principal sum has been made or duly provided for;
provided, however, that payment of interest may be made at the option of the
Company by check mailed to the address of the person entitled thereto as such
address shall appear on the Debt Security Register. Notwithstanding the
foregoing, if the Company shall default in the payment of interest due on any
Interest Payment Date, then this Note shall bear interest from the next
preceding Interest Payment Date, to which interest has been paid or, if no
interest has been paid on these Notes, from December 11, 2001. The interest so
payable on any Interest Payment Date, will, subject to certain exceptions
provided in the Indenture referred to on the reverse hereof, be paid to the
person in whose name this Note is registered at the close of business on the
June 1 or December 1 (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date. Interest will be computed on the basis of
a 360-day year of twelve 30-day months.

     Reference is made to the further provisions of this Note set forth on the
reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place.

     This Note shall not be valid or become obligatory for any purposes until
the certificate of authentication hereon shall have been signed by the Trustee
under the Indenture referred to on the reverse hereof.

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     IN WITNESS WHEREOF, OLIN CORPORATION has caused this instrument to be
signed by facsimile by its duly authorized officers and has caused a facsimile
of its corporate seal to be affixed hereunto or imprinted hereon.

Dated:  December 11, 2001              OLIN CORPORATION,

                                        By  /s/ Anthony W. Ruggiero
                                           -------------------------------------
                                           Name:   Anthony W. Ruggiero
                                           Title:  Executive Vice
                                                   President and Chief
                                                   Financial Officer

                                        By  /s/ Janet M. Pierpont
                                           -------------------------------------
                                           Name:   Janet M. Pierpont
                                           Title:  Vice President and
                                                   Treasurer

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                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

     This is one of the Debt Securities of the series designated therein
referred to in the within-mentioned Indenture.

                                        JPMORGAN CHASE BANK, as
                                        Trustee,

                                        By  /s/ Patrick J. Healy
                                           -------------------------------------
                                                   Authorized Officer

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                                OLIN CORPORATION

                           9.125% Senior Note due 2011

     This Note is one of a duly authorized issue of debentures, notes, bonds or
other evidences of indebtedness of the Company (the "Debt Securities") of the
series hereinafter specified, all issued or to be issued under and pursuant to
an indenture dated as of June 15, 1992 (the "Original Indenture"), as amended
and supplemented by the First Supplemental Indenture dated as of March 18, 1994,
and as amended and supplemented by the Second Supplemental Indenture dated as of
December 11, 2001 (the Original Indenture, as amended by the First Supplemental
Indenture and the Second Supplemental Indenture is herein called the
"Indenture"), duly executed and delivered by the Company to JPMorgan Chase Bank
(f/k/a Chemical Bank), as trustee (the "Trustee"), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder
of the Trustee, the Company and the holders of the Debt Securities. Capitalized
terms used herein and not defined herein have the meanings ascribed thereto in
the Indenture. The Debt Securities may be issued in one or more series, which
different series may be issued in various aggregate principal amounts, may
mature at different times, may bear interest (if any) at different rates, may be
subject to different redemption provisions (if any), may be subject to different
sinking, purchase or analogous funds (if any), may be subject to different
covenants and Events of Default and may otherwise vary as in the Indenture
provided. This Note is one of a series of Debt Securities designated as the
9.125% Senior Notes due 2011 of the Company (the "Notes"), initially in an
aggregate principal amount of $200,000,000 on the Issue Date. Terms used herein
which are defined in the Indenture shall have the respective meanings assigned
thereto in the Indenture.

     In case an Event of Default with respect to the Notes shall have occurred
and be continuing, the principal hereof may be declared, and upon such
declaration shall become, due and payable, in the manner, with the effect and
subject to the conditions provided in the Indenture.

     The Indenture contains provisions permitting the Company and the Trustee,
with the consent of the Holders of not less than 66-2/3% in aggregate principal
amount of the Debt Securities at the time Outstanding of all series to be
affected (voting as one class), evidenced as in the Indenture provided, to
execute supplemental indentures adding any provisions to or changing in any
manner or eliminating any of the provisions of the Indenture or of any
supplemental indenture or modifying in any manner the rights of the Holders of
the Debt Securities of each such series; provided, however, that no such
supplemental indenture shall (i) extend the fixed maturity of any Debt
Securities, or reduce the principal amount thereof or any premium thereon or the
amount of any Sinking Fund Payment, or reduce the rate or extend the time of
payment of interest thereon, or reduce any premium payable upon redemption
thereof, without the consent of

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the Holder of each Debt Security so affected, or (ii) reduce the aforesaid
percentage of Debt Securities the consent of the Holders of which is required
for any such supplemental indenture, without the consent of the Holders of each
Debt Security so affected. It is also provided in the Indenture that, with
respect to certain defaults or Events of Default regarding the Debt Securities
of any series, prior to any declaration accelerating the maturity of such Debt
Securities, the Holders of a majority in aggregate principal amount Outstanding
of the Debt Securities of such series (or, in the case of certain defaults or
Events of Default, all the Debt Securities) may on behalf of the Holders of all
the Debt Securities of such series (or all of the Debt Securities, as the case
may be) waive any such past default or Event of Default and its consequences.
The preceding sentence shall not, however, apply to a default in the payment of
the principal of, premium, if any, or interest, if any, on any of the Debt
Securities. Any such consent or waiver by the Holder of this Note (unless
revoked as provided in the Indenture) shall be conclusive and binding upon such
Holder and upon all future Holders and owners of this Note and any Notes which
may be issued in exchange or substitution herefor, irrespective of whether or
not any notation thereof is made upon this Note or such other Notes.

     No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Note at the place, at the respective times, at the rate and in the coin
or currency herein prescribed.

     The Notes are issuable in registered form without coupons in denominations
of $1,000 and any integral multiple of $1,000. At the office or agency of the
Company in the Borough of Manhattan, The City of New York, and in the manner and
subject to the limitations provided in the Indenture, but without the payment of
any service charge, Notes may be exchanged for a like aggregate principal amount
of Notes of other authorized denominations.

     The Notes will be redeemable as a whole at any time or in part from time to
time, at the option of the Company, on at least 30 but not more than 60 days
prior notice (a "Redemption Date"), at a redemption price equal to the greater
of (i) 100% of the principal amount of this Note and (ii) the present value of
the Remaining Scheduled Payments on the Notes being redeemed on the Redemption
Date, discounted to the Redemption Date on a semiannual basis (assuming a
360-day year consisting of twelve 30-day months) at the Treasury Rate (as
defined herein) plus 50 basis points, plus, in each case, accrued interest on
this Note to the Redemption Date (the "Redemption Price").

     "Comparable Treasury Issue" means the United States Treasury security
selected by an Independent Investment Banker as having a maturity comparable to
the remaining term of this Note to be redeemed that would be utilized, at the
time of selection and in accordance with customary financial practice, in
pricing new issues of corporate debt securities of comparable maturity to the
remaining term of this Note.

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"Independent Investment Banker" means Banc of America Securities LLC and/or
Salomon Smith Barney Inc.

     "Comparable Treasury Price" means, with respect to any Redemption Date, (i)
the average of Reference Treasury Dealer Quotations for such Redemption Date,
after excluding the highest and lowest such Reference Treasury Dealer
Quotations, or (ii) if the Trustee obtains fewer than three such Reference
Treasury Dealer Quotations, the average of all such quotations.

     "Reference Treasury Dealer" means Banc of America Securities LLC and
Salomon Smith Barney Inc. and, at the Company's option, other primary U.S.
Government Securities dealers in New York City selected by the Company.

     "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer and any Redemption Date, the average, as determined by
the Trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) quoted in
writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m., New York
City time, on the third Business Day preceding such Redemption Date.

     "Remaining Scheduled Payments" means, with respect to this Note, the
remaining scheduled payments of the principal and interest thereon that would be
due after the related Redemption Date but for such redemption; provided,
however, that, if such Redemption Date is not an Interest Payment Date with
respect to this Note, the amount of the next succeeding scheduled interest
payment thereon will be reduced by the amount of interest accrued thereon to
such Redemption Date.

     "Treasury Rate" means, with respect to any Redemption Date, the rate per
year equal to the semi-annual equivalent yield to maturity of the Comparable
Treasury Issue, assuming a price for the Comparable Treasury Issue (expresses as
a percentage of its principal amount) equal to the Comparable Treasury Price for
such Redemption Date.

     Unless the Company defaults in payment of the Redemption Price, on and
after the Redemption Date interest will cease to accrue on the Notes or portions
thereof called for redemption and those Notes will cease to be outstanding.

     Upon due presentment for registration of transfer of this Note at the
office or agency of the Company in the Borough of Manhattan, The City of New
York, a new Note or Notes of authorized denominations for an equal aggregate
principal amount will be issued to the transferee in exchange therefor, subject
to the limitations provided in the Indenture, without charge except for any tax
or other governmental charge imposed in connection therewith.

<PAGE>

     The Company, the Trustee, any paying agent and any Debt Security registrar
may deem and treat the registered Holder hereof as the absolute owner of this
Note (whether or not this Note shall be overdue and notwithstanding any notation
of ownership or other writing hereon), for the purpose of receiving payment
hereof, or on account hereof, and for all other purposes, and neither the
Company nor the Trustee nor any paying agent nor any Debt Security registrar
shall be affected by any notice to the contrary. All payments made to or upon
the order of such registered Holder shall, to the extent of the sum of sums
paid, effectually satisfy and discharge liability for moneys payable on this
Note.

     No recourse for the payment of the principal of, or premium, if any, or
interest on this Note, or for any claim based hereon or otherwise in respect
thereof, and no recourse under or upon any obligation, covenant or agreement of
the Company in the Indenture or any indenture supplemental thereto or in any
Note, or because of the creation of any indebtedness represented thereby, shall
be had against any incorporator, stockholder, officer or director, as such,
past, present or future, of the Company or of any successor corporation, either
directly or through the Company or any successor corporation, whether by virtue
of any constitution, statute or rule of law or by the enforcement of any
assessment or penalty or otherwise, all such liability being, by the acceptance
hereof and as part of the consideration for the issue hereof, expressly waived
and released.

     This Debt Security shall be deemed to be a New York contract, and for all
purposes shall be construed in accordance with the laws of said State.<PAGE>

                                                                   Exhibit 10(m)
                                 DESCRIPTION OF
                           RESTRICTED STOCK UNIT AWARD
                                GRANTED UNDER THE
                       OLIN 2000 LONG TERM INCENTIVE PLAN

1.   Terms

     The terms and conditions of these Restricted Stock Units are contained in
     the Award Certificate evidencing the grant of such Award, this Award
     Description and in the Olin 2000 Long Term Incentive Plan (the "Plan").

2.   Definitions

     "Vesting Date" means with respect to a Restricted Stock Unit, the date on
     which you become entitled to receive the shares underlying the Restricted
     Stock Unit, as set forth in your Award Certificate.

     Other capitalized terms used but not defined herein have the meanings
     specified in the Plan.

3.   Vesting and Payment

     (a)  Except as otherwise provided in the Plan or in this Award Description,
          your interest in the Restricted Stock Units awarded to you will vest
          only at the close of business on the Vesting Date for such Restricted
          Stock Units, if you are employed by Olin from the grant date through
          the Vesting Date. Each Restricted Stock Unit not vested shall be
          forfeited.

     (b)  Each vested Restricted Stock Unit shall be payable by delivery of one
          share of Olin Common Stock (subject to adjustment as provided in the
          Plan), except as otherwise provided in the Plan.

     (c)  Each outstanding Restricted Stock Unit shall accrue Dividend
          Equivalents (amounts equivalent to the cash dividends payable in
          cash), deferred in the form of cash. Such Dividend Equivalents shall
          be paid only when and if the Restricted Stock Unit on which such
          Dividend Equivalents were accrued vests. Dividend Equivalents will
          accrue interest at an annual rate equal to Olin's before tax cost of
          borrowing as determined from time to time by the Chief Financial
          Officer, the Treasurer or the Controller of the Company (or in the
          event there is no such borrowing, the Federal Reserve A1/P1 Composite
          rate for 90-day commercial paper plus 10 basis points, as determined
          by any such officer) or such other rate as determined from time to
          time by the Board or the Committee, compounded quarterly, from the
          date accrued to the earlier of the date paid or forfeiture. To the
          extent a Restricted Stock Unit does not vest or is otherwise
          forfeited, any accrued and unpaid Dividend Equivalents (and any
          interest on such Dividend Equivalents) shall be forfeited.

<PAGE>

     (d)  The total number of vested Restricted Stock Units (and Dividend
          Equivalents and related interest) at the end of a calendar year shall
          be paid on or before March 15 of the following year, except as
          otherwise specifically provided in the Plan.

     (e)  Restricted Stock Units shall carry no voting rights nor, except as
          specifically provided herein, be entitled to receive any dividends or
          other rights enjoyed by shareholders.

4.   Termination of Employment

     (a)  Any Restricted Stock Units not yet vested shall be forfeited if your
          employment terminates either for cause or without Olin's written
          consent. If your employment should terminate before the applicable
          Vesting Date without cause and with Olin's written consent or by
          virtue of your death or total disability or retirement under an Olin
          benefit plan, the Committee shall determine, in its sole discretion,
          which outstanding Restricted Stock Units not yet vested (including
          Dividend Equivalents and related interest), if any, shall not be
          forfeited provided that you are not a Section 16 officer or director
          of Olin when your employment terminates, the Chief Executive Officer
          of Olin shall be authorized to make such determination.

     (b)  With respect to any non-forfeited Restricted Stock Units (and Dividend
          Equivalents and related interest) of a terminated Participant relating
          to incomplete Vesting Period, you will receive shares in payment of
          such Restricted Stock Units (and related Dividend Equivalents and
          interest, if any) as soon as practicable, subject to the provisions of
          the Plan.

5.   Tax Withholding

     Olin will withhold from the payout of the Restricted Stock Units (and
     related Dividend Equivalents) the amount necessary to satisfy your federal,
     state and local withholding tax requirements.

6.   Miscellaneous

     By accepting the Award of Restricted Stock Units, you agree that such Award
     is special compensation, and that any amount paid will not affect

     (a)  The amount of any pension under any pension or retirement plan in
          which you participate as an employee of Olin,

     (b)  The amount of coverage under any group life insurance plan in which
          you participate as an employee of Olin, or

     (c)  The benefits under any other benefit plan or any kind heretofore or
          hereafter in effect, under which the availability or amount of
          benefits is related to compensation.

                                      2

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