Original Item: Only One Available. This is a very nice Civil War vintage U.S. Moore's Patent Firearms Co. No.1 Derringer in .41 rimfire caliber. These were made in Brooklyn, New York, as marked on the top of the single shot barrel:The pistols frame is engraved brass, which was originally Nickel plated, a good amount of which is worn away. The number 852 appears under frame.

2 1/2 inch rotating steel barrel