Calvin Johnson Autographed/Signed Detroit Lions F/S AMP Helmet Beckett 44033 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 Detroit Lions AMP Replica Full Size Helmet that was personally autographed by Calvin Johnson. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.