.52 caliber rimfire, 22″ barrel, hinged breechblock with external hammer.  Walnut stock bearing the U.S. inspector’s cartouches.   In very fine original condition with the barrel retaining much of it’s blue mixing with brown.  The casehardened finish on the breech block and lock now showing an even brown patina.  Very nice wood with good visible cartouches.  Excellent bright bore with sharp rifling.  Matching serial numbers (6323).   Overall a very pleasing example.