1



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

   

                                (Amendment No. 18)
                                     ------
    
                             20th Century Industries

                                (Name of Issuer)

                        Common Stock, Without Par Value

                         (Title of Class of Securities)

                                   901272 20 3

                                 (CUSIP Number)

                         Florence Davis, General Counsel
                       American International Group, Inc.
                  70 Pine Street, NYC, NY 10270 (212) 770-7000



            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)
   

                               February 5, 1999
    

             (Date of Event which Requires Filing of this Statement)           

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box: [ ].

NOTE:  Six copies of this statement, including all exhibits, should be
filed with the Commission.  See Rule 13d-1(a) for other parties to whom
copies are to be sent.








   2
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

American International Group, Inc.
(I.R.S. Identification No. 13-2592361)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            WC, OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Delaware

   

NUMBER OF               (7)  SOLE VOTING POWER
SHARES                          
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                     51,028,920                        
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                             51,028,920                        
    
   

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      51,028,920
                                          
    

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /
   

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      58.3%
                
    

(14)  TYPE OF REPORTING PERSON

      HC, CO


                                 -2-
   3
CUSIP NO. 901272 20 3



 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

American Home Assurance Company
(I.R.S. Identification No. 13-5124990)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /
   

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of New York


NUMBER OF               (7)  SOLE VOTING POWER
SHARES                         
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                       14,395,665           
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                               14,395,665          
    
   

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                               14,395,665
    

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /
   

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

          16.4     
    

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -3-
   4
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

Commerce & Industry Insurance Company
(I.R.S. Identification No. 31-1938623)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of New York


NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                        5,414,827
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                                5,414,827

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                5,414,827

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

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

      6.2%

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -4-



   5
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

New Hampshire Insurance Company
(I.R.S. Identification No. 02-0172170)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Pennsylvania


NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                        5,414,827
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                                5,414,827

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                5,414,827

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

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

      6.2%

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -5-
   6
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

National Union Fire Insurance Company of Pittsburgh, Pa.
(I.R.S. Identification No. 25-0687550)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            WC, OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Pennsylvania



   
NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                     25,803,601
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                             25,803,601


(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      25,803,601
    

 
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /


(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      29.5%
   
    


(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -6-
   7
ITEM 1.  SECURITY AND ISSUER.
   

            This Amendment No. 18 amends and supplements Item 5 of the Statement
on Schedule 13D dated December 16, 1994, as amended and supplemented by
Amendment No. 1 to Schedule 13D dated March 23, 1995, Amendment No. 2 to
Schedule 13D dated January 20, 1998, Amendment No. 3 to Schedule 13D dated April
9, 1998, Amendment No. 4 to Schedule 13D dated May 12, 1998, Amendment No. 5 to
Schedule 13D dated June 4, 1998, Amendment No. 6 to Schedule 13D dated June 15,
1998, Amendment No. 7 to Schedule 13D dated June 25, 1998, Amendment No. 8 to
Schedule 13D dated July 14, 1998, Amendment No. 9 to Schedule 13D dated July 23,
1998, Amendment No. 10 to Schedule 13D dated July 27, 1998, Amendment No. 11 to
Schedule 13D dated August 10, 1998, Amendment No. 12 to Schedule 13D dated
August 19, 1998, Amendment No. 13 to Schedule 13D dated August 24, 1998,
Amendment No. 14 to Schedule 13D dated September 3, 1998, Amendment No. 15 to
Schedule 13D dated September 11, 1998, Amendment No. 16 to Schedule 13D filed on
November 10, 1998  and Amendment No. 17 to Schedule 13D filed on December 16,
1998 ("Schedule 13D") previously filed by American International Group, Inc., a
Delaware corporation ("AIG"), relating to the common stock, without par value
("Common Stock"), of 20th Century Industries, a California corporation (the
"Company"). The principal executive offices of the Company are located at Suite
700, 6301 Owensmouth Avenue, Woodland Hills, California 91367.
    

            Each capitalized term used in this statement which is defined in the
Schedule 13D shall have the meaning ascribed thereto in the Schedule 13D.
            
          
ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER
   

            (a) Between December 17, 1998, and January 27, 1999 AIG, through
its subsidiary American Home, purchased 737,500 shares of Common Stock in open
market transactions effected on the New York Stock Exchange at prices ranging
from $20.0625 to $23.9375 per share as follows:
    
   

DATE SHARES PRICE ---- ------ ----- December 17, 1998 37,500 23.4375 " 50,000 23.5000 " 1,800 23.7500 " 29,400 23.8125 December 18, 1998 88,800 23.8750 " 30,000 23.9375 January 13, 1999 200,000 20.7500 January 14, 1999 95,000 20.2500 January 15, 1999 9,000 20.0625 " 1,100 20.2500 " 800 20.3125 " 500 20.3750 January 19, 1999 9,100 21.0000 " 2,300 20.9375 " 1,900 20.6875 " 900 20.6250 January 20, 1999 12,500 21.6250 " 9,900 21.5625 " 1,000 21.5000 " 1,000 21.4375 January 21, 1999 3,800 21.1875 " 4,800 21.2500 " 1,500 21.3750 " 1,000 21.4375 " 2,400 21.5625 " 11,600 21.6250 " 1,000 21.6875 " 3,400 21.7500 " 7,000 21.8125 January 22, 1999 900 21.5000 " 1,500 21.5625 " 5,300 21.6250 " 4,800 21.6875 " 5,000 21.7500 " 1,000 21.8125 January 25, 1999 100,000 21.5625
Between January 28, 1999 and February 5, 1999 AIG, through its subsidiary National Union, purchased 150,000 shares of Common Stock in open market transactions effected on the New York Stock Exchange at prices ranging for $21.0000 to $21.6875 per share as follows:
DATE SHARES PRICE ---- ------ ----- January 28, 1999 25,000 21.6875 January 29, 1999 15,000 21.2500 " 10,000 21.3750 February 2, 1999 5,000 21.1875 February 3, 1999 7,600 21.0000 " 300 21.0625 " 3,100 21.1250 " 6,600 21.1875 " 1,000 21.2500 " 300 21.3125 February 4, 1999 26,100 21.0000 February 5, 1999 50,000 21.2500
American Home's, National Union's and each other AIG Sub's current ownership interests in the Company and the Common Stock is set forth on the cover pages to this Amendment No. 18 to Schedule 13D. The ownership percentages appearing on such pages have been calculated based on the number of shares of Common Stock outstanding as of October 31, 1998 (87,601,698 shares) as reported by the Company in its Quarterly Report on Form 10-Q for the three month period ended September 30, 1998. -7- 8 (b). AIG and each AIG Sub share voting and dispositive power as to the securities owned by such AIG Sub. (c). AIG, American Home, Commerce & Industry, National Union, New Hampshire, SICO, The Starr Foundation and Starr, and, to the best of each of their knowledge, the Covered Persons, have not engaged in any transactions in the Common Stock since the filing of Amendment No. 17 to Schedule 13D, except for the purchase by American Home between December 17, 1998 and January 27, 1999 of 737,500 shares of Common Stock and the purchase by National Union between January 28, 1999 and February 5, 1999 of 150,000 shares of Common Stock as described in (a) above. -8- 9 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. Dated: February 5, 1999 AMERICAN INTERNATIONAL GROUP, INC. By: /s/ Kathleen E. Shannon --------------------------------------- Kathleen E. Shannon, Vice President, Secretary and Associate General Counsel AMERICAN HOME ASSURANCE COMPANY By: /s/ Edward E. Matthews --------------------------------------- Edward E. Matthews, Senior Vice President COMMERCE AND INDUSTRY INSURANCE COMPANY By: /s/ Edward E. Matthews --------------------------------------- Edward E. Matthews, Senior Vice President NATIONAL UNION FIRE INSURANCE COMPANY OF PITTSBURGH, PA. By: /s/ Edward E. Matthews --------------------------------------- Edward E. Matthews, Senior Vice President NEW HAMPSHIRE INSURANCE COMPANY By: /s/ Edward E. Matthews --------------------------------------- Edward E. Matthews, Vice President -9-