This is a fine Winchester Model 1866 Lever Action Carbine with Cody Firearms Museum letter and excerpt from Winchester factory ledger. The Cody Firearms Museum letter identifies it as a carbine and states that it was shipped from the Winchester warehouse on September 7, 1889. The carbine has the Fourth Model features which include the serial number stamped in script numerals on the lower tang behind the lever latch, iron carbine style buttplate and receiver with less drop at the rear. The carbine has the standard 20 inch round barrel and full length magazine. The barrel has the late, iron, block front sight located behind the barrel band and late pattern folding adjustable rear sight marked "1873" at the top of the leaf. These Model 1873 sights were used on only late Model 1866 carbines and are rare. A staple mounted saddle ring is located on the left side of the receiver. The buttplate has a sliding brass trap door, and the butt trap contains a three-piece, jointed steel cleaning rod with brass tip. The stock and forearm are straight grain American walnut. The carbine has the distinctive brass receiver. 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 between the lower barrel band and the rear sight. "44 R.F." is roll-stamped on the top of the barrel between the rear sight and the receiver. "44 CAL" is stamped in script letters on the bottom of the cartridge elevator, and the serial number is stamped in script numerals on the lower tang behind the lever latch. In "The Winchester Book" by Madis, the author notes that very few Model 1866 had caliber markings since .44 rimfire was standard.