Manufactured between 1860 and 1865 with a total production of about 3,000. This particular derringer has the early production top barrel marking ("D. MOORE PATENT, FEB 19, 1861") with the barrel release button on the right side of the frame. There are no other visible markings. There is a silver post front sight and a hammer notch rear sight. The frame and breech end sides of the barrel feature a broad scroll engraving and there are checkered panels on the sides, back and butt of the grip. Blue finished barrel with silver plated brass frame.