Rare Sonny Liston Autograph, Signed Index Card. Auto PSAThe Big Bear! Former Mafia enforcer turned World Heavyweight Champion, offered here is an elusive signature from Sonny Liston! Liston is considered one of the hardest hitting boxers in the history of the sport, and he also happens to be one of the toughest autographs! Liston grew up with very little education, so he struggled to sign his own name. His rough upbringing along with his untimely death in 1970 at just 38 years old, resulted in a very