Built between 1870 and 1890, this was the first single shot pistol produced by Colt after they purchased the patent rights from National Arms Co. German Silver half-moon front sight and hammer notch rear sight. The top of the barrel is marked "+COLT'S PT.F.A. MFG. Co./ HARTFORD CT. U.S.A./ No1+". The underside of the barrel is marked with British proof marks and then the serial number. The frame has some light floral scroll engraving and a checkered spur trigger and hammer. "41 CAL" is stamped directly below the barrel latch. The grip area is solid iron, with shallow checkering on the sides, deep, sharp checkering on the back strap, and the serial number repeated on the butt.

Extremely fine. The barrel has 75% of the bright original blue finish remaining with thinning blue at the muzzle and along the high edge showing scattered surface scratches. The frame compliments the barrel and retains 90% original silver also showing some high edge wear and isolated spotting. The trigger and hammer show areas of brilliant original casehardening colors. Mechanically fine. A rare Colt No. 1 Deringer in outstanding condition.