Or, if you can't be bothered to take the car apart, just look at the chassis number and compare it with these:
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Revision 1
December 1989 to December 1991
Chassis JT163SW2000000001 to JT163SW2000059265
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Revision 2
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December 1991 to November 1993
Chassis JT163SW2000059266 to JT163SW2000087385
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Revision 3
November 1993 to June 1996
Chassis JT163SW2000087386 to JT163SW2000106662
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Revision 3
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(10th Aniversary Ltd Edition)
December 1995 to Febuary 1996
Chassis JT163SW200010????
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Revision 4
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June 1996 to December 1997
Chassis JT163SW2000106663 to JT163SW2000110780
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(Approx)
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Revision 5
December 1997 to August 1999
Chassis JT163SW2000110780
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(Approx) to End of Production
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12/89
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-> 12/91 Rev1
12/91
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-> 10/93 Rev2
10/93
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-> 10/95 Rev3
10/95
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-> 10/97 Rev4
10/97
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-> 03/00 Rev5