We've had plenty of Muhammad Ali autographs over the years. Occasionally, we are able to cover Cassius Clay signed items, but pieces that are signed with both names are few and far between. Boxing buffs score a knockout collectible, with this twice-signed "The Greatest" hardcover book. Authored by John Hennessey, this 1991 first edition enters the ring in (NM) condition. Ali has signed the original dust jacket with both names, Muhammad Ali and Cassius Clay. These prized autographs have been applied by means of a silver felt-tip pen, and both signatures are ("8") strength examples. Full photo LOA from JSA.