Jack Sikma Autographed/Signed Pro Style Green Jersey Beckett 43439 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 Pro Style Green Jersey that was personally autographed by Jack Sikma. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.