EXHIBIT 99.1

                                     PROXY
                                     -----
                                  PV FINANCIAL

                  SOLICITED BY THE BOARD OF DIRECTORS FOR THE
                        SPECIAL MEETING OF SHAREHOLDERS

                                October __, 1994



    
     The undersigned holder of Common Stock acknowledges receipt of a copy of
the Notice of Special Meeting of Shareholders of PV Financial and the
accompanying Proxy Statement/Prospectus dated October __, 1994 (the "Proxy
Statement"), and, revoking any Proxy heretofore given, hereby constitutes and
appoints Robert J. Cardoza and Sarah Thompson, and each of them, with full power
of substitution, as attorneys and proxies to appear and vote all of the shares
of Common Stock of PV Financial, a California corporation, standing in the name
of the undersigned which the undersigned could vote if personally present and
acting at the Special Meeting of Shareholders of PV Financial, to be held at the
McHenry Branch of Pacific Valley National Bank, 1524 McHenry Avenue, Modesto,
California, on Monday, November 14, 1994, at 5:00 p.m. local time, or at
any adjournment or postponement thereof, upon the following items as set forth
in the Notice of Meeting and Proxy Statement and to vote according to their
discretion on all matters which may be properly presented for action at the
Special Meeting or any adjournment or postponement thereof.    

     To adopt and approve the Agreement and Plan of Reorganization dated as of
July 25, 1994, as amended (the "Agreement"), by and among Westamerica
Bancorporation ("Westamerica"), PV Financial and Pacific Valley National Bank,
and an Agreement of Merger (the "Merger Agreement") between Westamerica and PV
Financial (collectively, the "Agreements") and the transactions contemplated
thereby, including but not limited to, the amendment of the PV Financial 1991
Director Stock Option Plan and the merger of PV Financial with and into
Westamerica.


     [_]  FOR      [_]  AGAINST      [_]  ABSTAIN


THIS PROXY IS SOLICITED BY AND ON THE BEHALF OF THE BOARD OF DIRECTORS AND MAY
BE REVOKED PRIOR TO ITS EXERCISE.  THIS PROXY WHEN PROPERLY EXECUTED WILL BE
VOTED IN THE MANNER DIRECTED HEREIN BY

 
THE SHAREHOLDER(S).  IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED "FOR" THE
PROPOSALS SET FORTH.


                                    Shareholder(s):_____________________________


                            Signature___________________________________


                                    Signature___________________________________


                                    Date________________________________________

                                    Please date and sign exactly as your name(s)
                                    appear opposite.  When signing as attorney,
                                    executor, administrator, trustee or
                                    guardian, please give full title.  If more
                                    than one trustee, all should sign.  All
                                    joint owners should sign.

                                    I/WE do [_] or I/WE do not [_] expect to
                                    attend the Special Meeting.

                                    WHETHER OR NOT YOU PLAN TO ATTEND THE
                                    SPECIAL MEETING, PLEASE SIGN AND RETURN THIS
                                    PROXY AS PROMPTLY AS POSSIBLE IN THE
                                    ENCLOSED ENVELOPE.