This Autographed Alternate Eclipse Riddell Authentic Full Size Speed Proline Helmet with the inscription of "HOF 20" has been Personally Signed by Troy Polamalu of the Pittsburgh Steelers. 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 Troy Polamalu 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.