Excellent British-proofed Colt No1 Deringer s/n 3712, manufactured circa 1870-1890. Rare pistol (only about 6,500 manufactured) in obsolete .41 rimfire calibre. Barrel retains most of its original plated finish and strong case-colours to the hammer. Sharp barrel address, serial numbers and engraving to the frame. Good action with an average 7/10 bore.