Muhammad Ali Autographed Memorabilia. Add this Muhammad Ali Autographed Sports Illustrated Magazine Vintage - Beckett Certified to your sports memorabilia collection or give as a gift to a diehard, Muhammad Ali fan or collector. This is a Sports Illustrated Magazine that has been hand signed by Muhammad Ali. This is a vintage signature. It has been certified authentic by Beckett Authentication (BAS) and comes with their sticker and matching full page certificate of authenticity. Shop with confidence as this product has been authenticated by Beckett Grading Services and comes complete with a Certificate of Authenticity and matching tamper-evident sticker. SportsCollectibles.com is the online leader in certified Muhammad Ali signatures and autographed memorabilia. Your order will be picked, packed and shipped quickly and securely. Product is backed by Sports Collectibles 100% Money Back Guarantee.