Six large format photographs are signed by Muhammad Ali, each measuring 20x24." The gem is a black & white of Ali standing over a fallen Liston, which he has dual-signed "Muhammad Ali-Cassius Clay." Others include two celebratory photos of the 1964 Liston fight, a training portrait with his mouth wide open and a great shot of Ali punching Foreman in their 1974 battle. PSA/DNA has authenticated all six and five were done in their presence. Overall average in EX-NRMT condition.