AMERICAN PHYSICIANS SERVICE GROUP INC
SC 13G, 1998-05-22
MANAGEMENT SERVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                                (Amendment No.1)


                     American Physicians Service Group, Inc.
                                (Name of issuer)

                           Common Stock, $.10 par value per share
                         (Title of class of securities)

                                    028882108
                                 (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      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

         EQSF Advisers, Inc.
         (EIN 13-3354359)

- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a)  [   ]
                                                                     (b)  [   ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

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

                     New York Corporation

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

                                                 603,000

          NUMBER OF
                               -------------------------------------------------
            SHARES               6      SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                                     None
                               -------------------------------------------------
             EACH                7      SOLE DISPOSITIVE POWER
          REPORTING
            PERSON                               603,000

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

                                                         None
- --------------------------------------------------------------------------------
 9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  603,000

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

- --------------------------------------------------------------------------------
         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 11
                  14.52%

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

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

*SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- --------------------------------------------------------------------------------
  1      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

         M.J. Whitman Advisers, Inc.
         (EIN 13-3686379)

- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a)  [   ]
                                                                     (b)  [   ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

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

                     New York Corporation

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

                                                 61,500

          NUMBER OF
                               -------------------------------------------------
            SHARES               6      SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                                   None
                               -------------------------------------------------
             EACH                7      SOLE DISPOSITIVE POWER
          REPORTING
            PERSON                               61,500

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

                                                      None
- --------------------------------------------------------------------------------
 9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  61,500

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

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
                  1.48%

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

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

- --------------------------------------------------------------------------------
  1      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

                  Martin J. Whitman


- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a)  [   ]
                                                                     (b)  [   ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

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

                  USA

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

          NUMBER OF                              None  (See Item 4)
                               -------------------------------------------------
                                 6      SHARED VOTING POWER
            SHARES
                                                 None
         BENEFICIALLY

           OWNED BY
                               -------------------------------------------------
             EACH                7      SOLE DISPOSITIVE POWER

          REPORTING                              None  (See Item 4)

                               -------------------------------------------------
         PERSON WITH            8       SHARED DISPOSITIVE POWER

                                                 None

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

                  -0-    (See Item 4)

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

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  -0-

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

                  IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




<PAGE>

Item 1.
         (a)      Name of Issuer:
                  American Physicians Service Group, Inc. (the "Issuer").

         (b)      Address of Issuer's Principal  Executive Offices:
                  1301 Capital of Texas Highway,  Suite C-300,  Austin, TX 78746
Item 2.
         (a)      Name of Person  Filing:  
                  This  schedule is being  jointly filed by  EQSF Advisers, Inc.
("EQSF"),  M.J. Whitman Advisers, Inc. ("MJWA") and Martin J. Whitman, the Chief
Executive  Officer  of EQSF and MJWA and  controlling  person  of EQSF and MJWA.
(EQSF,  MJWA and  Martin J.  Whitman  are  sometimes  collectively  referred  to
hereinafter  as "Filer").  Attached  hereto as an exhibit is a copy of the joint
Schedule 13G filing agreement among the reporting persons.

         (b)      Address of Principal Business Office:
          The address of the principal  executive  office of EQSF,  MJWA and Mr.
Whitman is: 767 Third Avenue, New York, New York 10017-2023.

         (c)      Citizenship:

                  The  citizenship  or  place  of  organization  of  each of the
reporting persons is as follows:

                  EQSF

                  New York State corporation.

                  MJWA

                  New York State corporation.

                  Martin J. Whitman

                  United States citizen.

         (d)      Title of Class of Securities:

                  Common Stock, $.10 par value per share.

         (e)      CUSIP Number:

                  028882108


<PAGE>

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

         (e) Investment  Adviser registered under section 203 of the Investment
     Advisers Act of 1940 (EQSF and MJWA).

Item 4.  Ownership.
         (a)&(b)  EQSF  beneficially owns 603,000 shares, or 14.52% of the class
of securities of the issuer.  MJWA  beneficially owns 61,500 shares, or 1.48% of
the class of securities of the issuer.

                  (c)  (i) EQSF:  603,000
                           MJWA:   61,500

                       (ii) Not applicable.

                       (iii) EQSF:  603,000
                           MJWA:     61,500

                       (iv) Not applicable.

         Mr. Whitman disclaims beneficial ownership of all such shares.

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

<PAGE>

Item 6.  Ownership of More than Five Percent on Behalf of Another  Person. 
         Third Avenue Value Fund,  an  investment  company  registered under the
Investment Company Act of 1940, has the right to receive dividends from, and the
proceeds  from the sale of  557,000 of the shares  reported  by EQSF;  and Third
Avenue Value Portfolio of the WRL Series Fund, an investment  company registered
under the  Investment  Company Act of 1940,  has the right to receive  dividends
from,  and the proceeds from the sale of 46,000 of the shares  reported by EQSF.
Various  clients  for whom MJWA  acts as  investment  advisor  have the right to
receive  dividends from, and the proceeds of the sale of, the shares reported by
MJWA.

Item 7.  Identification and Classification of the Subsidiary Which Acquired
         the Security Being Reported on By the Parent Holding Company. 
                  Not Applicable.

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

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

Item 10. Certification.
                  By signing  below I certify  that, to the best of my 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 purposes or effect.


<PAGE>

                                    SIGNATURE

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


                                                               May 22, 1998
                                                               (Date)




                                                     EQSF ADVISERS, INC.

                                                     By:/s/   MARTIN J. WHITMAN
                                                     Martin J. Whitman
                                                     Chairman and Chief
                                                     Executive Officer





                                                     M.J. WHITMAN ADVISERS, INC.

                                                     By:/s/ MARTIN J. WHITMAN
                                                     Martin J. Whitman
                                                     Chairman and Chief 
                                                     Executive Officer





                                                     /s/MARTIN J. WHITMAN
                                                     Martin J. Whitman






                             JOINT FILING AGREEMENT


                  In  accordance  with  Rule  13d-1  (f)  under  the  Securities
Exchange  Act of 1934,  as amended,  the  undersigned  hereby agree to the joint
filing  with all  other  Reporting  Entities  (as such  term is  defined  in the
Schedule  13G)  on  behalf  of  each of them  of a  statement  on  Schedule  13G
(including  amendments thereto) with respect to the Common Stock, $.10 par value
per share, of American  Physicians  Service Group, Inc., and that this Agreement
be included as an Exhibit to such joint filing.  This  Agreement may be executed
in any number of counterparts  all of which taken together shall  constitute one
and the same instrument.


                  IN  WITNESS  WHEREOF,  the  undersigned  hereby  execute  this
Agreement this 22nd day of May, 1998.



                                                     EQSF ADVISERS, INC.

                                                     By:/s/   MARTIN J. WHITMAN
                                                     Martin J. Whitman
                                                     Chairman and Chief
                                                     Executive Officer




                                                    M. J. WHITMAN ADVISERS, INC.

                                                    By:/s/ MARTIN J. WHITMAN
                                                    Martin J. Whitman
                                                    Chairman and Chief Executive
                                                    Officer




                                                     /s/MARTIN J. WHITMAN
                                                     Martin J. Whitman



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