This is a really nice Colt 61 Navy Original Metallic Cartridge Conversion with 45% thinning blue and 55% vibrant case colors. The serial number is 38000 and is all matching numbers and would be near the end of production in 1878. The rear of the cylinder is stamped 8000, the last 4 digits of the serial number. The mechanical function is very good plus, crisp and tight. The bore is very good bright and shiny with strong rifling.