Gun Owned by Butch Cassidy Auctioned in Calif. A .45-caliber gun once owned by Butch Cassidy has sold at auction in Southern California for $175,000. A spokesman for the private seller said Sunday that the Colt Single Action Army revolver went to an anonymous online bidder. The gun is accompanied by a black leather shoulder holster and two binders filled with documentation verifying the revolver's authenticity. Cassidy, the infamous Old West bank robber, bought the revolver in a hardware store in Vernal, Utah, in 1896. He turned it over to Utah authorities in early 1900 in an unsuccessful attempt to gain amnesty. Known as the "Amnesty Colt," it is the most documented of Cassidy's guns. The outlaw was immortalized in the 1969 film "Butch Cassidy and the Sundance Kid." He was played by Paul Newman. Sunday's sale was held by California Auctioneers of Ventura.