Manufactured in 1889 and chambered in .476 Eley. 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 2,026 revolvers were shipped in this caliber and barrel length and only 2,458 were shipped in this caliber. The top of the barrel is marked "COLTS PT FA MFG Co HARTFORD CT. U.S.A. DEPOT 14 PALL MALL LONDON," "476 CAL" marked on the trigger guard, lanyard ring on the butt and London proofs are present.

Very fine, retaining 70% original blue finish with numerous scattered scratches and dings with a smooth brown patina on the balance and very scattered light pitting. The slightly oversized replacement grips are very good with a repaired chip on the right panel and some blemishes in the overall crisp checkering. There is slight play in the cylinder although the action cycles properly.