Colt's First Model Derringer was based on the design first manufactured by Moore Patent Firearms Co. and then the National Arms Co. before it was purchased by Colt in 1870. They were manufactured until 1890. Colt advertised this model as the "No. 1 National Deringer." This example has flourishes of scroll engraving on the sides of the frame and behind the hammer and a small burst pattern at the breech. The markings and other features are standard.

Very fine with 80% original nickel plating, flaking at the muzzle and sides of the frame, crisp engraving, moderate marks and scratches, and significant case colors on the hammer. Mechanically excellent.