An estimated 12,000 of these pistols were manufactured before the National Arms Co. was purchased by Colt in 1870. Colt then produced the design as their "National Derringer." The top of the barrel has the one-line address, and the serial number is on the underside. "G6" is on the left side of the grip frame and is hand marked on the underside of the grips. It also features a German silver blade front sight, flourishes of scrollwork on each side of the frame and at the breech, burst patterns behind the hammer well, "piano" varnished walnut grips, and full blue finish.