Stefon Diggs Autographed/Signed Buffalo Bills Speed Mini Helmet Beckett 37039 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 speed mini helmet that was personally autographed by Stefon Diggs. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.