Muhammad Ali Autographed Memorabilia. Check out Muhammad Ali Autographed Sports Illustrated Magazine - PSA/DNA Certified. Collectors and fans will love this Sports Illustrated Magazine that has been hand signed by Muhammad Ali. It has been certified authentic by PSA/DNA and comes with their sticker and matching full page certificate of authenticity. Talk about a great gift idea for a Other Sports Memorabilia > Boxing collector or a Muhammad Ali fan. Product will ship in 1-3 business days with free shipping on orders over $200. Shop with confidence as this is an authenticated Muhammad Ali autograph.