Jim Plunkett Signed Stanford Cardinal 1991 Heisman #36 Beckett Slab 40732 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a 1991 Heisman #36 trading card that was personally autographed by Jim Plunkett. This was professionally authenticated and slabbed by Beckett Authentication Services (BAS), also includes a certificate of authenticity from Denver Autographs.