S&W No.3 ‘American’ 1st Model cavalry revolver
Manufactured by Smith and Wesson c.1870~72 for the US 2nd, 3rd, 4th, 5th, 6th, and 7th of Cavalry – serial number 431.
.44 American 6-round cylinder, single action, top break action, first model ‘oil hole’ below the barrel.
The United States’ first standard issue revolver, it would later be improved with the Schofield model which used a shortened .45 Colt cartridge.