Approximately 9,000 "conversions" were manufactured c. 1871-1878 using the Richards system, patented July 25th, 1871. This example is part of a separate approximate serial range 1-8700 made with some new parts and some surplus components, with others found within the standard Model 1860 Army approximate serial range 167000-200600. Designed by Charles Brinckerhoff Richards (1835-1919), one of the co-designers of the famous Colt Single Action Army. Richards revolvers were an important stepping stone to the Single Action Army and many saw intense use on the western frontier. They feature a breech plate with an integral notch rear sight and a floating firing pin instead of using a hammer mounted firing pin. An ejector rod housing is fitted to the right side of the barrel and a filler slot in place of the loading lever. German silver blade front sight, "-ADDRESS COL. SAML COLT NEW-YORK U.S. AMERICA-" marked on top of the barrel, 1871 and 1872 patent dates on the left of the frame, Texas Battle of Campeche Navy scene on the cylinder, matching visible serial number "4613" on the barrel, frame, trigger guard, butt and cylinder with assembly number "2716" on the loading gate (wedge unable to be removed).

Very good plus, retains 20% original blue finish concentrated in protected areas of the barrel, ejector housing and backstrap with smooth brown patina on the balance, traces of case colors visible in protected areas of the frame, visible cylinder scene, a few small patches of light pitting, and bright golden patina on the brass. Grip is fine very with a few light scratches, some scattered small spots of outer surface flaking, and defined edges. Mechanically fine.