This is a Winchester Fourth Model 1866 Saddle Ring Carbine that was manufactured in 1891. The carbine has the iron buttplate found on late production Model 1866 rifles and carbines. The 20-inch round barrel has two barrel bands with a block iron front sight and folding leaf rear sights. The left side of the receiver has a staple-mounted saddle ring. The top of the barrel is marked "WINCHESTER-REPEATING-ARMS NEW HAVEN CT. / KING'S-IMPROVEMENT-PATENTED-MARCH 29. 1866.OCTOBER 16. 1860". Between the lower barrel band and the rear sight. The caliber "44 B" is stamped on the top of the barrel between the rear sight and the receiver. "44 CAL." is inscribed on the bottom of the cartridge elevator. The serial number is located on the lower receiver tang behind the loading lever latch. Blue barrel and magazine tube, casehardened hammer and lever and mounted with a smooth forearm and straight grip stock with steel carbine buttplate with compartment, (cleaning rod not included).