This Winchester Model 1866 rifle was manufactured in 1881. The rifle has the Fourth Model receiver profile and serial number roll-stamped on the lower tang behind the lever latch. The rifle has a full-octagon barrel and full-length magazine. The barrel has a dove-tail mounted sporting style front sight and a buckhorn sporting style rear sight. The upper tang is factory drilled and tapped for a rear sight. The stock has a crescent steel buttplate with sliding brass trap door. The hammer spur has bordered impressed knurling. The barrel, magazine and forearm cap are blued and the hammer, trigger, lever and crescent buttplate are casehardened. The stock and forearm are straight grain American walnut. The top of the barrel is roll-stamped: "WINCHESTER'S-REPEATING-ARMS. NEW HAVEN. CT./KING'S-IMPROVEMENT-PATENTED-MARCH 29. 1866. OCTOBER 16. 1860." in two lines ahead of the rear sight. The serial number "158676" is stamped in script numerals on the lower tang between the lever latch and the tang screw.