Dallas Cowboys Triplets Signed Authentic Helmet Aikman Smith Irvin BAS 28401 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 authentic/proline helmet that was personally autographed by Troy Aikman, Emmitt Smith and Michael Irvin. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.