This Autographed Authentic Full Size Speed Proline Helmet with the inscription of "Heisman 17 (Mayfield), Heisman 2018 (Murray) Heisman 2008 (Bradford) Heisman 1978 (Sims), Heisman 2003 (White), Heisman 1969 (Owens)" has been Personally Signed by Baker Mayfield, Kyler Murray, Sam Bradford, Billy Sims, Jason White & Steve Owens of the Oklahoma Sooners. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. This is a BAS Witnessed Protection Program item which means a Beckett Authentication Service representative was present when this item was being signed. This is a stock item. We conducted an autograph signing with Baker Mayfield, Kyler Murray, Sam Bradford, Billy Sims, Jason White & Steve Owens and we have several of these available. The one you will receive will be of equal quality to the one pictured. This item can be verified through BAS Witnessed.