Muhammad Ali Autographed Memorabilia. Muhammad Ali Autographed Black Louisville Slugger Bat - JSA Certified. This is a Louisville Slugger bat that has been hand signed by Muhammad Ali. The autograph is certified authentic by JSA and comes with their sticker and matching full page certificate of authenticity. This product makes for an excellent collectible for a fan or memorabilia collector. A bold, prisitine Muhammad Ali signature. SportsCollectibles.com offers the best prices for Muhammad Ali Autographed Misc. Your order Backed by Sports Collectibles 100% Money Back Guarantee. and is Backed by Sports Collectibles 100% Money Back Guarantee. Shop authentic signed sports memorabilia at SportsCollectibles.com.