Muhammad Ali Autographed Memorabilia. Check out Muhammad Ali Autographed Sports Illustrated Magazine Gem Mint 10 Vintage - PSA/DNA. This Sports Illustrated Magazine that has been personally hand signed by Muhammad Ali. This vintage signature. The signature was graded a Gem Mint 10 by PSA. It has been certified authentic by PSA/DNA and comes with their authentication sticker and matching full page certificate of authenticity. PSA/DNA is the leading third-party authenticator in the autograph industry. This signed publication is a great gift idea for any sports fan or memorabilia collector. Commemorate the great career of Muhammad Ali with this autographed publication, or check out other souvenirs at SportsCollectibles.com for more products autographed by Muhammad Ali. When it comes to Sports Memorabilia, SportsCollectibles.com offers a wide selection of Muhammad Ali Autographed Magazines. Product will ship in 1-3 business days with free shipping on orders over $200. Buy with confidence as this is an authenticated Muhammad Ali autograph.