Ricky Williams Autographed/Signed Custom Trading Card PSA Slab 43800 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is the exact item that you will receive so please see pictures for condition. This is a trading card that was personally autographed by Ricky Williams. This has been professionally slabbed by Professional Authentication Services (PSA) and includes a certificate of authenticity from Denver Autographs.