This Autographed Limited Edition 36/47 Authentic Full Size Speed Proline Helmet with the inscription of "23 CFP CHAMPS (Harbaugh)" has been Personally Signed by Jim Harbaugh, J.J. McCarthy, Blake Corum, Roman Wilson, Colston Loveland, Zak Zinter, Will Johnson, Mason Graham, Cornelius Johnson, Mike Barrett, Junior Colson, Rod Moore, Kenneth Grant, Trente Jones, Jaylen Harrell, Max Bredeson, Benjamin Hall, Kris Jenkins, Braiden McGregor, Semaj Morgan of the Michigan Wolverines. This item is 100% Authentic to includes a numbered hologram by Fanatics. The authenticity can be verified on Fanatics website.