Amendment No. 1              Exhibit 10.a
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                         CROWN CORK & SEAL COMPANY, INC.
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                  1990 STOCK-BASED INCENTIVE COMPENSATION PLAN
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     Pursuant to the power reserved to it in Section 11 of the Crown Cork & Seal
Company, Inc. 1990 Stock-Based Incentive Compensation Plan ("Plan"),  Crown Cork
& Seal  Company,  Inc.  hereby  amends the Plan,  effective  September 21, 1998,
as follows:

1.       SECTION 8.08 is amended in its entirety to read as follows:

         "8.08    Termination by Reason of Retirement or Disability:
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          (A)  If a  Holder's  employment  by the  Company  or a  Subsidiary  or
               Affiliate  terminates by reason of disability  (as  determined by
               the  Committee)  any Option held by such Holder may thereafter be
               exercised  by the Holder (or,  where  appropriate,  the  Holder's
               legal  representative),  to the extent it was  exercisable at the
               time of termination or on such accelerated basis as the Committee
               may  determine at or after  grant,  for a period of 3 months from
               the  date  of  such   termination  of  employment  or  until  the
               expiration of the stated term of the Option,  whichever period is
               shorter.

          (B)  If a  Holder's  employment  by the  Company  or a  Subsidiary  or
               Affiliate terminates by reason of Retirement,  any Option held by
               such Holder may  thereafter be exercised by the Holder (or, where
               appropriate,  the Holder's legal representative) to the extent it
               was exercisable at the time of the Holder's Retirement or on such
               accelerated  basis as the  Committee  may  determine  at or after
               grant,  for a period  of up to five  years (as  specified  by the
               Committee),  but only  three  months in the case of an  Incentive
               Stock Option,  from the date of the Holder's  Retirement or until
               the expiration of the stated term of the Option, whichever period
               is shorter."

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     To record the adoption of this  Amendment  No. 1 to the Plan,  Crown Cork &
Seal Company,  Inc. has  authorized its officers to affix its corporate name and
seal effective as of the day and year first above written.


CORPORATE SEAL                              CROWN CORK & SEAL COMPANY, INC.


Attest:                                     By:    /s/ Alan W. Rutherford
                                            Title: Executive Vice President and
                                                   Chief Financial Officer