Approximately 7,000 manufactured circa 1872-1873 as some of the first Colt cartridge revolvers available in the West. New York address on top of barrel, two-line 1871 and 1872 patent markings on left of frame. "U.P.R.R. Express" inscribed on the backstrap for the Union Pacific Railroad Express Agency.

Good with a mottled gray patina, initials carved on refinished grip. Cylinder does not lock.