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When one is simply known as "The Greatest," it does not matter what medium they pen their autographs on. Featured is a Muhammad Ali single-signed baseball. This relatively clean 1994 OWS ("7") sphere is inked on the sweet spot in blue ballpoint pen. The autograph grades an impressive ("8"). Interestingly, the enigmatic Ali signed an official ball for a World Series that was never played. Full photo LOA from James Spence Authentications.