Stefon Diggs Autographed Buffalo Bills Authentic Flash Speed Helmet BAS 34527 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 Buffalo Bills full size authentic flash speed helmet that was personally autographed by Stefon Diggs. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.