Troy Polamalu Autographed Pittsburgh Steelers F/S AMP Speed Helmet BAS 29650 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a Pittsburgh Steelers full size AMP speed replica helmet that was personally autographed by Troy Polamalu. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.