Global gems go under the hammer 

Andy Warhol ‘Muhammad Ali’ Arguably the most famous name in pop art meets arguably the most famous sportsman of the 20th century in this set of four screen prints from 1978, created at the behest of US investment banker Richard Weisman. “I felt putting the series together was natural, in that two of the most popular leisure activities at the time were sports and art, yet to my knowledge they had no direct connection,” Weisman said in 2007.

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