.54 caliber, 8 1/2″ barrel with captivated ramrod. Lock plate marked “U.S. / H. ASTON & CO.” and dated “1851” at the rear. Brass mounts with blued trigger. Half stock bearing two U.S. inspector’s cartouches on the left flat. Various inspector’s stamps appear on the appropriate parts. In superb original condition showing little evidence use. Appears unissued.