This is a unique example of an experimental prototype Harpers Ferry two-band Model 1855 rifle, without the typical Harpers Ferry maker marking on the lock (it does not appear to have ever had it), and an early adjustable screw pattern flip-up ladder rear sight of the type typically seen on Harpers Ferry altered Model 1841 Mississippi rifles. This is the only example like it known by this writer. It most certainly appears to be the work of Harpers Ferry Armory, and was likely made as a sample piece in the early stages of development of the U.S. Model 1855 rifle. The officially adopted production type I examples have a standard ramped base ladder rear sight; 10 of which were reportedly manufactured with the ramped sight in fiscal year 1857, and 374 in 1858. The "1858" barrel date on this example suggests it was fabricated that year. "1857" date marking at the tail of the lock with a federal eagle on the primer door, "1858" date marking top of the breech of the barrel with "V/P/eagle head" proofs on the left quarter, standard pinched blade front sight, bayonet lug mounted on the right for use with a saber bayonet (not included), three-groove rifling with a .58 caliber bore, oval cutout inside the patchbox, and unmarked/uninspected stock and buttplate. Many firearms in backroom storage, including a number of prototypes and production Model 1855 rifles, were destroyed when the Harpers Ferry Armory was burned in 1861, so the fact that this prototype rifle survived makes it an extremely rare specimen.

Fine, retains 70% original brown finish on the barrel with areas of fading, patterns of case colors visible inside the protected primer area of the lock, 70% original blue finish on the rear barrel band with traces visible on the front barrel band, trigger guard and buttplate, with scattered surface spotting/oxidation, bright golden patina on the brass patchbox, and sharp markings and edges in the metal overall. Stock is very fine with rich original oil finish and attractive original raised grain, a few scattered scratches and dents, a minor small crack visible ahead of the top of the buttplate, and distinct edges. Mechanically excellent. This unique experimental prototype Harpers Ferry Model 1855 rifle would be a significant addition to any advanced U.S. martial arms collection!