Dak Prescott Autographed Dallas Cowboys Authentic Flat White Helmet BAS 28674 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a Dallas Cowboys full size Flat White authentic/proline helmet that was personally autographed by Dak Prescott. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.