This autographed full size Riddell replica speed helmet has been personally hand-signed by 13 members of the Oakland Raiders including Khalil Mack, Tim Brown, Art Shell, Ray Guy, Willie Brown, Dave Casper, Bo Jackson, Ted Hendricks, Fred Biletnekoff, Howie Long, Jim Otto, Marcus Allen & JIm Plunkett. Some signers added inscriptions with their Hall of Fame induction year. This autograph is certified by James Spence Authentication (JSA). It comes with the numbered hologram and matching Letter of Authenticity.