Marty York Signed The Sandlot 20 Anniv. Insert Beckett Auto 10 40660 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.