This is an extraordinary example of a late production Fourth Model 1866 carbine that was manufactured by the Winchester Repeating Arms Co. in 1890. The carbine has the distinctive brass receiver with blue 20-inch barrel, 13-shot magazine and barrel bands. The hammer, lever, trigger and carbine style iron buttplate are color casehardened. The loading gate and bolt are niter blue. The stock and forearm are oil finished straight grain American walnut. The carbine has the Fourth Model features which include: receiver profile with less drop ahead of the hammer than earlier models, iron buttplate with sliding brass trapdoor and serial number stamped on the lower tang between the lever latch and tang screw. A staple mounted saddle ring is located on the left side of the receiver. The upper tang is factory drilled and tapped for a rear sight. The barrel has a block mounted steel front sight located behind the upper barrel band and late sporting style folding leaf rear sight marked "1873" and graduated to 900 yards. The magazine has the late style screw fastened cap. The hammer has forged bordered knurling on the spur. The butt trap contains a four piece jointed steel cleaning rod with brass tip. The top of the barrel is roll stamped with the second style legend "WINCHESTER'S-REPEATING-ARMS. NEW HAVEN. CT./KING'S-IMPROVEMENT-PATENTED-MARCH 29. 1866. OCTOBER 16. 1860." ahead of the rear sight and the late "44 B" caliber marking between the rear sight and the receiver. "44 CAL" is stamped in script letters on the bottom of the cartridge elevator. The serial number "168988" is stamped in script numerals on the lower receiver tang.