Dak Prescott Signed Dallas Cowboys F/S Flat White Speed Helmet Beckett 39752 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 Dallas Cowboys full size flat white speed replica helmet that was personally autographed by Dak Prescott. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.