BAY VIEW CAPITAL CORP
SC 13G, 1998-02-02
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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                                           UNITED STATES                        
                                SECURITIES AND EXCHANGE COMMISSION              
                                      Washington, D.C. 20549                    
                                                                                
                                                                                
                                                                                

                              INITIAL SCHEDULE 13G







                    Under the Securities Exchange Act of 1934



                             Bay View Capital Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    07262L101
- --------------------------------------------------------------------------------
                                 (CUSIP Number)



*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





                                PAGE 1 OF 9 PAGES


<PAGE>
<TABLE>
<CAPTION>


     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   07262L101                                    13G                    Page  2  of  9  Pages
- ---------------------------------------                                         --------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Mutual Life Insurance Company
          I.R.S. No. 04-1414660
- --------- ------------------------------------------------------------------------------------------------------------

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY


- --------- ------------------------------------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts

- --------- ------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

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

  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

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

    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

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

                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None,  except  through its  indirect,  wholly-owned  subsidiary,  John
          Hancock Advisers, Inc.


- --------- ------------------------------------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.


- --------- ------------------------------------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IC, IA, HC

- --------- ------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 2 OF 9 PAGES


<PAGE>



     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   07262L101                                    13G                    Page  3  of  9  Pages
- ---------------------------------------                                         --------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Subsidiaries, Inc.
          I.R.S. No. 04-2687223
- --------- ------------------------------------------------------------------------------------------------------------

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY

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

   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------- ------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

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

  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

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

    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

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

                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None,  except  through its  indirect,  wholly-owned  subsidiary,  John
          Hancock Advisers, Inc.
- --------- ------------------------------------------------------------------------------------------------------------

   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.


- --------- ------------------------------------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC

- --------- ------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 3 OF 9 PAGES


<PAGE>



     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   07262L101                                    13G                    Page  4  of  9  Pages
- ---------------------------------------                                         --------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          The Berkeley Financial Group
          I.R.S. No. 04-3145626
- --------- ------------------------------------------------------------------------------------------------------------

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY


- --------- ------------------------------------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts

- --------- ------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-


                   -------- ------------------------------------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

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

    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

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

                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None, except through its direct, wholly-owned subsidiary, John Hancock
          Advisers, Inc.
- --------- ------------------------------------------------------------------------------------------------------------

   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------- ------------------------------------------------------------------------------------------------------------

   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.

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

   12     TYPE OF REPORTING PERSON*

          HC

- --------- ------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 4 OF 9 PAGES


<PAGE>



     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   07262L101                                    13G                    Page  5  of  9  Pages
- ---------------------------------------                                         --------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Advisers, Inc.
          I.R.S. No. 04-2441573

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

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY

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

   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------- ------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 757,400


                   -------- ------------------------------------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each
                            -0-

                   -------- ------------------------------------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  757,400


                   -------- ------------------------------------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          757,400
- --------- ------------------------------------------------------------------------------------------------------------

   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------- ------------------------------------------------------------------------------------------------------------

   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          6.2%

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

   12     TYPE OF REPORTING PERSON*

          IA

- --------- ------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 5 OF 9 PAGES
</TABLE>


<PAGE>



         The original  statement  shall be signed by each person on whose behalf
the  statement is filed or his  authorized  representative.  If the statement is
signed  on behalf of a person by his  authorized  representative  other  than an
executive  officer or general  partner of the  filing  person,  evidence  of the
representative's  authority to sign on behalf of such person shall be filed with
the  statement,  provided,  however,  that a power of attorney  for this purpose
which is already on file with the Commission may be  incorporated  by reference.
The name and any title of each person who signs the statement  shall be typed or
printed beneath his signature.

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission.

     Attention:  Intentional  misstatements  or  omissions  of  fact  constitute
Federal criminal violations (See 18 U.S.C. 1001)


         Item 1(a)    Name of Issuer:
                      Bay View Capital Corp.

         Item 1(b)    Address of Issuer's Principal Executive Offices:
                      2121 South El Camino Real
                      San Mateo, CA   94403

         Item 2(a)    Name of Person Filing:
                      This filing is made on behalf of John Hancock  Mutual Life
                      Insurance   Company    ("JHMLICO"),    JHMLICO's   direct,
                      wholly-owned subsidiary,  John Hancock Subsidiaries,  Inc.
                      ("JHSI"),  JHSI's  direct,  wholly-owned  subsidiary,  The
                      Berkeley Financial Group ("TBFG") and TBFG's  wholly-owned
                      subsidiary, John Hancock Advisers, Inc. ("JHA").

         Item 2(b)    Address of the Principal Offices:
                      The  principal  business  offices of JHMLICO  and JHSI are
                      located at John Hancock Place,  P.O. Box 111,  Boston,  MA
                      02117. The principal  business offices of TBFG and JHA are
                      located at 101 Huntington  Avenue,  Boston,  Massachusetts
                      02199.

         Item 2(c)    Citizenship:
                      JHMLICO and TBFG were  organized  and exist under the laws
                      of the  Commonwealth of  Massachusetts.  JHSI and JHA were
                      organized  and  exist  under  the  laws  of the  State  of
                      Delaware.

         Item 2(d)    Title of Class of Securities:
                      Common Stock

         Item 2(e)    CUSIP Number:
                      07262L101

         Item 3       If the Statement is being filed pursuant to Rule 13d-1(b),
                      or 13d-2(b),  check whether the person filing is a:

                      JHMLICO: (c) (X) Insurance Company as defined in ss.3(a)
                                       (19) of the Act.

                               (e) (X)  Investment Adviser registered under
                                        ss.203 of the Investment Advisers Act 
                                        of 1940.

                               (g) (X)  Parent Holding  Company,  in accordance
                                        with ss.240.13d-1(b)(ii)(G).


                                            PAGE  6  OF  9  PAGES

<PAGE>



                      JHSI:    (g) (X) Parent Holding Company, in accordance 
                                       with ss.240.13d-1(b)(ii)(G).

                      TBFG:    (g) (X) Parent Holding Company, in accordance 
                                       with ss.240.13d-1(b)(ii)(G).

                      JHA:     (e) (X) Investment Adviser registered under 
                                       ss.203 of the Investment Advisers Act of 
                                       1940.

         Item 4       Ownership:

                      (a)    Amount   Beneficially   Owned:   JHA   has   direct
                             beneficial  ownership  of 757,400  shares of Common
                             Stock. Through their parent-subsidiary relationship
                             to JHA,  JHMLICO,  JHSI  and  TBFG  have  indirect,
                             beneficial ownership of these same shares.  757,400
                             shares are held by the John Hancock  Regional  Bank
                             Fund, an open-end  diversified  management  company
                             registered  under  ss.8 of the  Investment  Company
                             Act.

                      (b)        Percent of Class:  6.2%

                      (c) (i)    sole power to vote or to direct the vote:
                                 JHA has  sole  power to vote or  direct  the
                                 vote of the 757,400  shares of Common  Stock
                                 under the Advisory Agreement as follows:

                                                             Date of
                                                Number       Advisory
                      Fund Name                 of  Shares   Agreement
                      John Hancock Regional 
                      Bank Fund                  757,400      July 1, 1996

                      (ii)   shared power to vote or to direct the vote:     -0-

                      (iii)  sole  power  to  dispose  or to  direct  the
                             disposition   of:  JHA  has  sole  power  to
                             dispose or to direct the  disposition of the
                             757,400  shares  of Common  Stock  under the
                             Advisory  Agreement  noted  in Item  4(c)(i)
                             above.

                      (iv)   shared power to dispose or to direct the 
                             disposition of:     -0-

         Item 5       Ownership of Five Percent or Less of a Class:
                      Not applicable.

         Item 6       Ownership of More than Five Percent on Behalf of Another 
                      Person:  See Item 4.

         Item 7       Identification  and  Classification  of the  Subsidiary
                      which  Acquired  the  Security  Being  Reported  on by the
                      Parent Holding Company:
                      See Items 3 and 4 above.

         Item 8       Identification and Classification of Members of the Group:
                      Not applicable.

         Item 9       Notice of Dissolution of a Group:
                      Not applicable.



                                PAGE 7 OF 9 PAGES
<PAGE>
 

         Item 10      Certification:
                      By signing below the  undersigned  certifies  that, to the
                      best of its knowledge and belief, the securities  referred
                      to above were acquired in the ordinary  course of business
                      and were not  acquired  for the purpose of and do not have
                      the effect of changing or  influencing  the control of the
                      issuer  of  such  securities  and  were  not  acquired  in
                      connection  with or as a  participant  in any  transaction
                      having such purpose or effect.

                                    SIGNATURE

         After  reasonable  inquiry and to the best of its knowledge and belief,
each of the  undersigned  certifies  that  the  information  set  forth  in this
statement is true, complete and correct.


                                   John Hancock Mutual Life Insurance Company
                                   By:      /s/John T. Farady
                                            ------------------------------------
                                   Name:    John T. Farady
Dated: January 27, 1998            Title:   Senior Vice President & Treasurer

                                   John Hancock Subsidiaries, Inc.
                                   By:      /s/John T. Farady
                                            ------------------------------------
                                   Name:    John T. Farady
Dated: January 27, 1998            Title:   Treasurer

                                   The Berkeley Financial Group
                                   By:      /s/Susan S. Newton
                                            ------------------------------------
                                   Name:    Susan S. Newton
Dated: January 27, 1998            Title:   Vice President

                                   John Hancock Advisers, Inc.
                                   By:     /s/Susan S. Newton
                                           -------------------------------------
                                   Name:    Susan S. Newton
Dated: January 27, 1998            Title:   Vice President





                                PAGE 8 OF 9 PAGES


<PAGE>



EXHIBIT A
                             JOINT FILING AGREEMENT

         John Hancock Mutual Life Insurance Company,  John Hancock Subsidiaries,
Inc., The Berkeley  Financial Group and John Hancock  Advisers,  Inc. agree that
the Initial  Schedule 13G, to which this Agreement is attached,  relating to the
Common Stock of Bay View Capital Corp. is filed on behalf of each of them.





                                   John Hancock Mutual Life Insurance Company
                                   By:      /s/John T. Farady
                                            ------------------------------------
                                   Name:    John T. Farady
Dated: January 27, 1998            Title:   Senior Vice President & Treasurer

                                   John Hancock Subsidiaries, Inc.
                                   By:      /s/John T. Farady
                                            ------------------------------------
                                   Name:    John T. Farady
Dated: January 27, 1998            Title:   Treasurer

                                   The Berkeley Financial Group
                                   By:      /s/Susan S. Newton
                                            ------------------------------------
                                   Name:    Susan S. Newton
Dated: January 27, 1998            Title:   Vice President

                                   John Hancock Advisers, Inc.
                                   By:     /s/Susan S. Newton
                                           -------------------------------------
                                   Name:    Susan S. Newton
Dated: January 27, 1998            Title:   Vice President



                                PAGE 9 OF 9 PAGES



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