Fran Tarkenton Autographed Minnesota Vikings F/S AMP Speed Helmet JSA 30530 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a Minnesota Vikings full size AMP speed helmet that was personally autographed by Fran Tarkenton. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.