This Autographed Full Size Speed Proline Helmet W/ Uv Mirrored Back Acrylic Display Case 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. We conducted an autograph signing with Troy Polamalu where multiples of the same item were signed. While the photographs are representative of this item, the size, placement and strength of the signature may vary. Each item is hand signed, therefore, each autograph is unique. This item can be verified through BAS Witnessed.