Derrick Thomas Signed Kansas City Chiefs 9/24/1995 Gameday Magazine JSA 37721 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 Kansas City Chiefs September 24, 1995 Gameday magazine that was personally autographed by Derrick Thomas. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.