Colt 3rd model (Thuer) derringer with nearly a 100% coverage. Possible Helfricht shop engraved or New York retailer, although unverifiable. See “THE BOOK OF COLT ENGRAVING, VOLUME ONE” by R. L. Wilson for comparable engraved derringers. “D” is stamped beneath grip opposite side of serial. Gold plated frame, blued barrel. Larger “-COLT-” marking on barrel, “.41 CAL” on left side. 3rd variation style grip with rosewood, matching serial is penciled on grip to serial on frame. Condition: Antique excellent. Only appreciable wear is thinning gold and tarnish on back strap. one bruised screw on barrel. Wood has a few light nicks. Bore is heavily pitted. CLASS: FFL / C&R ELIGIBLE