.46 rimfire caliber, 20″ round barrel, split breech rolling block action 1st type casehardened action ( small ).   Walnut forend and buttstock bearing two U.S. inspector’s cartouches on the left wrist.  In very fine original condition with the barrel having a smooth plum patina mixing with blue.  The frame retains strong mottled case colors and show little wear from use.  Nice wood and strong cartouches.   Very nice bright bore with sharp rifling.  Very scarce and difficult to find in this high condition.