This M1876 rifle is a First Model manufactured without the dust cover. The lower tang is numbered "4852", which is out of the First Model range, however other "Open Top" M1876's are known out of the range. The left side of the lower tang under the stock and the under tang slot on the stock are numbered "2351", which is the original assembly number. The top of the barrel is marked "WINCHESTER'S - REPEATING ARMS. NEW HAVEN. CT. / KING'S- IMPROVEMENT - PATENTED - MARCH 29, 1866. OCTOBER 16. 1860." ahead of the rear sight, there is no caliber markings on the barrel or carrier. The upper tang is marked with the early style "--MODEL 1876--" and the remarked serial number on the lower tang behind the lever latch. Brass blade front sight and adjustable folding rear sight graduated to 1,000 yards and mounted with a smooth forearm and straight grip stock with a steel forend cap and steel crescent buttplate with compartment.