AN UNUSUAL D.B. FLINTLOCK CARBINE with sighted brass barrels fitted with spring bayonet below, tang engraved with rococo ornament, signed border engraved flat bevelled locks with large rollers (one top jaw and screw replaced), figured walnut half-stock, engraved brass mounts including butt-plate and trigger-guard, iron bayonet release, and brass-mounted wooden ramrod mounted on one side, by Ketland & Co., London, Tower private proof marks, circa 1800