.52 caliber, 22″ barrel marked “NEW MODEL 1863”  at the breech.  Original percussion falling block action with external sidelock hammer.   Walnut forend and buttstock show two U.S. inspector’s cartouches.  The barrel showing a pleasing gun metal gray color mixing with some patina.  The lock, hammer, and action having a mottle gray/brown mixing with traces of casehardened finish.  Very nice wood that has been reoiled.  Good bore.  Serial range C56xx