Also known as the Enfield Mark III Ball cartridge, the .476 was introduced in 1881 and phased out in 1887 but continued to be produced at the Woolrich Arsenal until March 1893 and the Dum Dum ammunition factory in India until 1918. The first .476 Model 1878 revolver was shipped to the London Agency on June 26, 1884, according to the late Don Wilkerson in "Colt's Double-Action Revolver, Model of 1878", and the last was shipped on October 24, 1898. Wilkerson found only 2,458 revolvers were shipped in this caliber. The barrel has the one-line Colt Pall Mall London legend, the trigger guard is marked "476 CAL.," and London proofs are on the underside of the barrel and behind each cylinder flute. The included factory letter confirms the current configuration as well as shipment to Colt's London Agency on 8 February 1886 as part of a 100 gun shipment.

Fine, retains 50% of the original blue finish with the balance having thinned to mostly a smooth brown patina mixed with some grey and some scattered minor dings throughout. The right forward lower frame shows a patch of cold blue touch up over some abrasive marks. The grips are very go0d, the original left panel showing mild wear and the replacement right panel with detached threaded screw grommet. Mechanically excellent.