This Model 1859 Sharps rifle is in the correct configuration of the special ordered rifles produced for the 1st and 2nd U.S. Sharpshooter Regiments (Berdan's Sharpshooters) in 1862 and falls within the correct serial number range, especially the 54390-55574 "primary range" for Berdan Sharps into which this rifle falls. The Ordnance Department's initial order was for standard Model 1859 rifles, but Colonel Hiram Berdan contacted the factory and requested a dull barrel finish and double set triggers. The factory assumed Berdan had permission for the changes and began producing rifles for the unit to his specifications, but once the Ordnance Department got word, they insisted that they would not pay for additional rifles in the altered configuration. However, given that the specifications Berdan requested did not actually cost more due to the use of a socket bayonet rather than a sword bayonet, Sharps may have just continued making the rifles as Berdan requested. Many of the rifles were used by the Sharpshooters, but others were diverted and used by other units such as the Bucktails (13th Pennsylvania). This rifle has a nickel-silver blade front sight, Lawrence patent notch and ladder rear sight, standard markings, adjustable double set triggers, long military style forearm, sling swivels on the middle barrel band and buttstock, an iron patch box, and is correctly not fit with a lever latch. The left side of the barrel has an "OWA" (Orville W. Ainsworth) inspection mark, and the left side of the stock has a "JT" (John Taylor) cartouche. Taylor inspected all 2,000 of the Berdan special contract rifles between April 11 and May 24, 1862, per Wiley Sword in "Sharpshooter." Sword lists "54478" in his "List of Surviving Sharps Berdan Rifles - Correct Profile" on page 98. This may have been a misreading of the serial number of this rifle. The right side of the buttstock has seven kill notches, and the left side has carving "I killed at Cock Robin." The "Cock" is a bit hard to read and could be a similar word. Unfortunately no information concerning the marking is available to provide more details.