Muhammad Ali "Aka Cassius Clay" & Joe Frazier Autographed Original Ali Vs. Frazier Poster. Signed in blue Pen across the front of the poster. Authenticated by James Spence, Cert #Z97632. This is an original close captioned advertisement poster from the fight. This was the last time the name Casius Clay appeared on a advertisement, afterwards it was only Muhammad Ali. This is a super rare piece, with Ali's inscribed name of Cassius Clay.