<PAGE>
                                                                     EXHIBIT 4.3

THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT") OR ANY STATE SECURITIES LAW.
THESE SECURITIES MAY NOT BE SOLD OR OFFERED FOR SALE IN THE ABSENCE OF AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND ANY APPLICABLE STATE
SECURITIES LAWS, OR AN EXEMPTION THEREFROM.

THIS WARRANT MAY NOT BE EXERCISED EXCEPT IN COMPLIANCE WITH ALL APPLICABLE
FEDERAL AND STATE SECURITIES LAWS TO THE REASONABLE SATISFACTION OF THE COMPANY
AND LEGAL COUNSEL FOR THE COMPANY.

                                               Warrant to Purchase 16,875 Shares
                                               of Common Stock

                                               January 10, 2001

                             STOCK PURCHASE WARRANT

         This Warrant is issued by Dickie Walker Marine, Inc., a Colorado
corporation, formerly known as Montiel Marketing Group, Inc. (the "Company") to
and for the benefit of Schneider Securities, Inc. ("Holder").

         WHEREAS, this Warrant is being issued pursuant to an Engagement Letter
between the Company and Holder dated January 16, 2001 made in connection with a
private placement of securities conducted by the Company.

         NOW, THEREFORE, for good and valuable consideration, consisting of the
covenants contained in the Engagement Letter, the Company agrees as follows:

         1. Grant of Warrant. The Company hereby grants to Holder, the right to
purchase, subject to the terms and conditions hereinafter set forth, an
aggregate of 16,875 fully paid and nonassessable shares ("Shares") of the common
stock of the Company ("Common Stock").

         2. Warrant Price. The purchase price of the Shares upon exercise of
this Warrant shall be $1.20 per share (the "Exercise Price").

         3. Term. The purchase right represented by this Warrant is exercisable,
in whole or in part, at any time and from time to time for a period of four (4)
years beginning on April 11, 2001 (the "Exercise Period"). The Company shall
have no obligation to furnish any further notice of the expiration date of this
Warrant to Holder before the expiration date.

         4. Method of Exercise; Payment; Issuance of New Warrant.

                  a. Subject to paragraph 3 hereof, Holder may exercise the
purchase right represented by this Warrant, in whole or in part, by delivering
to the principal office of the



<PAGE>

Company a notice of exercise ("Exercise Notice") in the form attached hereto as
Exhibit A, duly executed, this Warrant, and payment to the Company, by check, of
an amount equal to the then applicable Warrant Price per share multiplied by the
number of Shares then being purchased. The Company shall within twenty (20)
business days after its receipt of the original Exercise Notice, this Warrant
and payment, issue and deliver to the Holder at the address of Holder as
reflected in the Company's records, or at such other place designated by Holder,
a certificate evidencing the issuance of those Shares to which Holder is
entitled pursuant to the terms hereunder. If this Warrant is not fully
exercised, a new Warrant representing the portion of the Shares with respect to
which this Warrant shall not have been exercised shall be issued to Holder
within thirty (30) days. No cashless exercise of this Warrant shall be
permitted.

                  b. If the Company conducts an initial public offering of its
securities, or if the Company shall sell all or substantially all of its assets,
or if the Company's shareholders shall sell all or substantially all of their
securities in the Company in a single transaction, or if the Company merges with
or into another corporation (a "Transaction"), the Company shall have the right,
upon thirty (30) days' written notice to Holder, to require Holder to either
exercise or forfeit the Warrant on or before the closing date of such
Transaction.

                  c. Exercise shall be deemed to be effective on the date the
Exercise Notice, this Warrant and payment are received by the Company as
described in (a) above. Upon the effective date of exercise, the Holder shall be
deemed to be the holder of record of the Shares, notwithstanding that the
certificate representing the Shares shall not then be actually delivered to such
Holder or that such Shares are not then set forth on the stock transfer books of
the Company.

         5. Stock Fully Paid; Reservation of Shares. All Shares which may be
issued upon the exercise of the rights represented by this Warrant will, upon
issuance, be fully paid and nonassessable, and free from all taxes, liens and
charges with respect to the issue thereof. During the period within which the
rights represented by this Warrant may be exercised, the Company will at all
times have authorized, and reserved for the purpose of the issue upon exercise
of the purchase rights evidenced by this Warrant, a sufficient number of shares
of its Common Stock to provide for the exercise of the rights represented by
this Warrant.

         6. Adjustment of Warrant Price and Number of Shares. Subject to the
Company's right to require exercise or forfeiture of this Warrant, as specified
in Section 4.b. of this Warrant, the number and kind of securities purchasable
upon the exercise of this Warrant and the Exercise Price shall be subject to
adjustment from time to time upon the occurrence of certain events, as follows:

                  (a) Reclassification or Merger. In case of any
reclassification or change of outstanding securities of the class issuable upon
exercise of this Warrant (other than a change in par value, or from par value to
no par value, or from no par value to par value, or in case of any merger of the
Company with or into another corporation (other than a merger with another



                                       2
<PAGE>

corporation in which the Company is a continuing corporation and which does not
result in any reclassification or change of outstanding securities issuable upon
exercise of this Warrant), or in case of any sale of all or substantially all of
the assets of the Company, the Company shall, as condition precedent to such
transaction, cause provisions to be made so that Holder shall have the right,
upon exercise of this Warrant, to receive, in lieu of each share of the Common
Stock theretofore issuable upon exercise of this Warrant, the kind and amount of
shares of stock, other securities, money and property receivable upon such
reclassification, change or merger by the holder of one share of the Common
Stock. The provisions of this subparagraph (a) shall similarly apply to
successive reclassifications, changes, mergers and sales of assets.

                  (b) Subdivision or Combination of Shares. If the Company at
any time while this Warrant remains outstanding and unexpired shall subdivide or
combine its Common Stock, the Exercise Price shall be proportionately decreased
in the case of a subdivision or increased in the case of a combination.

                  (c) Stock Dividends. If the Company at any time while this
Warrant is outstanding and unexpired shall pay a dividend with respect to Common
Stock payable in Common Stock, or make any other distribution with respect to
Common Stock (except any distribution specifically provided for in the foregoing
subparagraphs (a) and (b)) then the Exercise Price shall be adjusted, from and
after the date of determination of shareholders entitled to receive such
dividend or distribution, to that price determined by multiplying the Exercise
Price in effect immediately prior to such date of determination by a fraction
(a) the numerator of which shall be the total number of shares of Common Stock
outstanding immediately prior to such dividend or distribution, and (b) the
denominator of which shall be the total number of shares of Common Stock
outstanding immediately after such dividend or distribution.

                  (d) Adjustment of Number of Shares. Upon each adjustment in
the Exercise Price, the number of Shares of Common Stock purchasable hereunder
shall be adjusted, to the nearest whole share, to the product obtained by
multiplying the number of Shares purchasable immediately prior to such
adjustment in the Exercise Price by a fraction, the numerator of which shall be
the Exercise Price immediately prior to such adjustment and the denominator of
which shall be the Exercise Price immediately thereafter.

         7. Notice of Adjustments. Whenever any Exercise Price shall be adjusted
pursuant to paragraph 6 hereof, the Company shall make a certificate signed by
its chief financial officer setting forth, in reasonable detail, the event
requiring the adjustment, the amount of the adjustment, the method by which such
adjustment was calculated, and the Exercise Price or Prices after giving effect
to such adjustment, and shall cause copies of such certificate to be mailed by
first class mail, postage prepaid, to Holder.

         8. Fractional Shares. No fractional shares of Common Stock will be
issued in connection with any exercise hereunder, but in lieu of such fractional
shares the Company shall make a cash payment therefore in an amount determined
in such reasonable manner as may be prescribed by the board of directors of the
Company.



                                       3
<PAGE>

         9. Compliance with Securities Act; Disposition of Shares of Common
Stock.

         By acceptance hereof, Holder agrees that this Warrant and the shares of
Common Stock to be issued upon exercise hereof are being acquired for investment
and that it will not offer, sell or otherwise dispose of this Warrant or the
Shares except under circumstances which will not result in a violation of the
Securities Act of 1933, as amended (the "Act"). In the absence of registration
of the Shares, upon exercise of this Warrant, Holder shall confirm in writing,
in the form attached hereto as Exhibit B, that the shares of Common Stock so
purchased are being acquired for investment and not with a view toward
distribution or resale. In addition, Holder shall provide such additional
information regarding Holder's financial and investment background as the
Company may reasonably request. All shares of Common Stock issued upon exercise
of this Warrant (unless registered under the Act) shall be stamped or imprinted
with a legend in substantially the following form:

"THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE
"ACT"). NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT THE PRIOR WRITTEN CONSENT
OF THE COMPANY AND WITHOUT REGISTRATION UNDER THE ACT AND APPLICABLE STATE
SECURITIES LAWS, IF ANY, OR PURSUANT TO EXEMPTIONS THEREFROM."

         10. Rights of Shareholders. Holder shall not be entitled to vote or
receive dividends and shall not be deemed the holder of Common Stock or any
other securities of the Company which may at any time be issuable on the
exercise hereof for any purpose. Nothing contained herein shall be construed to
confer upon Holder, as such, any of the rights of a shareholder of the Company
or any right to vote for the election of directors or upon any matter submitted
to shareholders at any meeting thereof, or to give or withhold consent to any
corporate action (whether upon any recapitalization, issuance of stock,
reclassification of stock, change of par value or change of stock to no par
value, consolidation, merger, conveyance, or otherwise) or to receive notice of
meetings, or to receive dividends or subscription rights or otherwise until the
Warrant shall have been exercised and the Shares purchasable upon the exercise
hereof shall have become deliverable, as provided herein.

         11. Governing Law. The terms and conditions of this Warrant shall be
governed by and construed in accordance with Colorado law.

         12. Miscellaneous. The headings in this Warrant are for purposes of
convenience and reference only, and shall not be deemed to constitute a part
hereof. Neither this Warrant nor any term hereof may be changed, waived,
discharged or terminated orally but only by an instrument in writing signed by
the Company and the registered holder hereof. All notices, requests and other
communications to any party hereunder shall be in writing (including telecopy or
similar writing) and shall be given to such party at its address or telecopy
number contained in the Company's records or such other address or telecopy
number as such party may hereafter specify in writing to the Company at such
address for that purpose, or, if to the Company, to 470 Nautilus, Suite 312, La
Jolla, CA 92037, attention President. Each such notice, request or other
communication shall be effective (i) if given by telecopy, when such



                                       4
<PAGE>

message is transmitted to the telecopy number contained in the Company's records
or such other number as a party may specify in writing to the Company at such
address, or (ii) if given by any other means, the earlier of (x) when delivered
by hand to the address contained in the Company's record or such other address
as a party may specify in writing to the Company at such address or (y) five (5)
business days after the mailing of such notice by certified mail.

                  IN WITNESS WHEREOF, the Company has caused this Warrant to be
executed in its name by the signature of its President and attested by the
signature of its Chief Financial Officer. This Warrant is dated as of the date
first written above.

                                            DICKIE WALKER MARINE, INC.
ATTEST:


By: /s/ GERALD W. MONTIEL                   By: /s/ JULIA SARGENT
   ----------------------------------          ---------------------------------
   Gerald W. Montiel, Chief Financial          Julia Sargent, President
   Officer



                                       5
<PAGE>

                                    EXHIBIT A
                            TO STOCK PURCHASE WARRANT


                               NOTICE OF EXERCISE

TO:      DICKIE WALKER MARINE, INC.

         1. The undersigned hereby elects to purchase ____________ shares of
common stock of Dickie Walker Marine, Inc. pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price of such shares in
full, together with all applicable transfer taxes, if any.

         2. Please issue a certificate or certificates representing said shares
of common stock in the name of the undersigned or in such other names as is
specified below:


                                       -----------------------------------------
                                       (Name)


                                       -----------------------------------------

                                       -----------------------------------------
                                       (Address)

         3. [For use only in the absence of an effective registration statement
covering the Shares.] The undersigned represents that the aforesaid shares of
common stock are being acquired for the account of the undersigned for
investment and not with a view to, or for resale in connection with, the
distribution thereof and that the undersigned has no present intention of
distributing or reselling such shares. In support thereof, the undersigned has
executed an Investment Representation Statement attached hereto as Exhibit B.



                                       -----------------------------------------
                                                      (Signature)
-----------------------------
           (Date)



                                       6
<PAGE>

                                    EXHIBIT B
                            TO STOCK PURCHASE WARRANT


                       INVESTMENT REPRESENTATION STATEMENT



PURCHASER:
                  --------------------------

COMPANY:          DICKIE WALKER MARINE, INC.

SECURITY:         COMMON STOCK

AMOUNT:
                  --------------------------

DATE:
                  --------------------------


In connection with the purchase of the above-listed securities (the
"Securities"), I, the Purchaser, represent to the Company the following:

         (a) I am aware of the Company's business affairs and financial
condition, and have acquired sufficient information about the Company to reach
an informed and knowledgeable decision to acquire the Securities. I am
purchasing these Securities for my own account for investment purposes only and
not with a view to, or for the resale in connection with, any "distribution"
thereof for purposes of the Securities Act of 1933 ("Securities Act").

         (b) I understand that the Securities have not been registered under the
Securities Act in reliance upon a specific exemption therefrom, which exemption
depends upon, among other things, the bona fide nature of my investment intent
as expressed herein. In this connection, I understand that, in the view of the
Securities and Exchange Commission ("SEC"), the statutory basis for such
exemption may be unavailable if my representation was predicated solely upon a
present intention to hold these Securities for the minimum capital gains period
specified under tax statutes, for a deferred sale, for or until an increase or
decrease in the market price of the Securities, or for a period of one year or
any other fixed period in the future.

         (c) I further understand that the Securities must be held indefinitely
unless subsequently registered under the Securities Act or unless an exemption
from registration is otherwise available. In addition, I understand that the
certificate evidencing the Securities will be imprinted with a legend which
prohibits the transfer of the Securities unless they are registered or such
registration is not required in the opinion of counsel for the Company.

         (d) I am aware of the provisions of Rule 144, promulgated under the
Securities Act, which, in substance, permits limited public resale of
"restricted securities" acquired, directly



                                       7
<PAGE>

or indirectly, from the issuer thereof (or from an affiliate of such issuer), in
a non-public offering subject to the satisfaction of certain conditions.

         (e) I further understand that at the time I wish to sell the Securities
there may be no public market upon which to make such a sale.

         (f) I further understand that in the event all of the requirements of
Rule 144 are not satisfied, registration under the Securities Act, compliance
with Regulation A, or some other registration exemption will be required; and
that, notwithstanding the fact that Rule 144 is not exclusive, the Staff of the
SEC has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rule 144 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk.


                                       Signature of Purchaser:


Date:
     -------------------------         -----------------------------------------



                                       8