STEVE YOUNG SIGNED CUSTOM TAMPA BAY BUCCANEERS BUCS JERSEY BECKETT. This jersey was authenticated by Beckett Authentication Services (BAS). They are the worlds leaders in autograph authentication. This jersey will come with a COA that is issued by Beckett. You can go to the Beckett Authentication Service's website and verify the autograph by entering the certificate number. The certificate number for the item is listed in the title and is on the COA.