Jack Youngblood Signed Autographed Florida Gators Riddell Replica Full Size Helmet. This licensed Helmet has been signed by Jack Youngblood. The autograph has been certified authentic by JSA and comes with their authentication sticker and matching certificate of authenticity that can be verified online. This signed Helmet is a great gift idea for any Florida Gators fan or memorabilia collector. Check out other memorabilia at Prime One Sports.com. Shop with confidence as all signatures are 100% authentic. Prime One Sports backs this product with our 100% Money Back Guarantee. .