45 caliber Peacemaker revolver 12", designed by Samuel Colt, USA 1873. Also known as "Single Action Army". Initially used by the US army, it is the quintessential revolver and possibly the first reliable handgun of history.It was manufactured with different barrel lengths: short version, 4.75 inches, the longer forms, of 5.5 and 7.5 inches, or the imposing "Buntline Special", 12 inches, used by the legendary Wyatt Earp Service with the Peace Commission of Dodge City;
It has received several nicknames: "Frontier" or "Widowmaker".The fact that it used the ammunition of the same caliber than the Winchester rifle M1873 used, made it become the most famous gun in the Old West. The film industry mythologized the "Peacemaker" in westerns films of the 40's and 50's.
The Colt 45 is one of the longest guns ever manufactured; Roosevelt had one engraved with his initials and George S. Patton used two.