Mike Singletary Autographed/Signed Chicago Bears 16x20 Photo HOF BAS 29230 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a 16x20 Photo that was personally autographed by Mike Singletary with HOF inscription. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.