Smith Carbine, .50 cal. breech-loading percussion carbine.  Serial #19501, mfg. by American Machine Works.   Very good condition.   21 5/8” half-octagon barrel has pitted bore with strong rifling, correct sights, 75% original finish.    Receiver and hammer have good original fading finish with crisp address and patent markings, some “blotching” and dings around percussion bolster and action hinge pin.  Trigger guard and lower tang are mostly patina.  Saddle ring is missing.  Stock and forearm have very good finish with some handling dings.  No inspection marks visible.  Plunger-operated tilting barrel mechanism works OK.  A nice example of this famous Civil War carbine!  Antique, can ship to your door.