Joe Montana Autographed 1991 Pro Set #387 Trading Card Beckett 10 Slab 37591 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is a trading card that was personally autographed by Joe Montana. This has been professionally slabbed by Beckett Authentication Services (BAS) and includes a certificate of authenticity from Denver Autographs.