Marty York Autographed/Signed The Sandlot 20 Anniv. Insert Beckett 40699 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a 2013 20th Anniversary Sandlot Movie Insert trading card that was personally autographed by Marty York. This was professionally authenticated and slabbed by Beckett Authentication Services (BAS), also includes a certificate of authenticity from Denver Autographs.