The consignor indicated this is one of three Colt factory toolroom conversions from his collection and notes that toolroom workmen in the 1870s "were given free rein to develop conversion systems that would enable sales of surplus percussion revolvers." See the article "Colt's Toolroom in the 1870s" by Dick Salzer in Arms Heritage Magazine Vol. 1 Issue 2 for more details. The revolver's serial number dates to 1854, the barrel has the early New York City address. The frame has the small "COLTS/PATENT" marking on the left. The cylinder has the standard Navy roll scene and is cut for use with metallic cartridges including recesses at the back of the chambers unlike the standard conversion. The breech plate/recoil shield is secured to the frame by three screws, and the loading gate has an unusual release lever and latch rather than the spring used on the standard conversions. The hammer has a long firing pin and no notch rear sight. The revolver is not fitted with an ejector and retains the original percussion loading lever. The matching serial numbers are stamped on the loading lever, wedge, barrel, cylinder, cylinder pin, frame, and grip straps and handwritten in ink in the back strap mortise of the grip. The reworked components are a mix of in-the-white and dull blue, and the breech plate appears to have been finished in a plum brown. The barrel is the original bright blue, and the grip straps have the original silver plating.