A double-signed photographic presentation of Muhammad Ali and Ken Norton, an 8 by 10in. colour action print signed in blue marker pen by Norton and bl

A double-signed photographic presentation of Muhammad Ali and Ken Norton, an 8 by 10in. colour action print signed in blue marker pen by Norton and black marker pen by Ali, mounted under lucite on a marble effect backboard applied with title plaque and boxing motifs, 38 by 30.5cm., 15 by 12in.