The Model 1878 is an internal hammer, breech loading single shot rifle manufactured from 1878 to 1881 with a total production of approximately 6,900 in the military configuration, with a number sold to foreign countries. The top of the barrel is marked "Old Reliable" in script and "SHARPS RIFLE CO. BRIDGEPORT. CONN." behind the rear sight, and the left side of the receiver is marked "SHARPS RIFLE CO. BRIDGEPORT CONN./U.S.A." above the serial number and "PAT DEC.. 1876". The top of the receiver is marked "J.P. LOWER/DENVER COL". It is equipped with a square base blade front sight/bayonet lug, folding ladder rear sight graduated to 1,000 yards and sliding trigger safety. Mounted with a smooth forearm with two barrel bands, iron ramrod, and straight grip stock with a checkered iron buttplate. There is a sling swivel mounted on the forward barrel band and underside front of the receiver.

Fine. The barrel is a mix of original blue finish and smooth brown patina. The receiver retains 70% original thin blue finish with areas of smooth plum patina. The breech block and lever have a mottled brown patina with some oxidation beginning to form on the lever. The wood is very good with overall scattered minor dings, dents and scratches associated with a gun of this age. The markings are clear. The action is fine.