Dak Prescott Signed Dallas Cowboys Authentic Salute Speed Flex Helmet BAS 39759 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 authentic salute speed flex helmet that was personally autographed by Dak Prescott. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.