This is a .69 caliber, smoothbore, single-shot muzzleloader, 58" long and weighing 9 lb 15 oz. The lock is marked "US" (the eagle motif has worn off) and to the rear of the cock "SPRING/FIELD/1831". The black walnut stock is 36" long and its distinguishing feature is the absence of a comb. The acid brown barrel is 42" long with a bayonet lug on top of the barrel. This is a Type II "National Armory Brown" musket notable because all the metal is finished brown. According to Reilly, in 1848 some 325,000 of these muskets were determined suitable for alteration to percussion ignition. These were subsequently issued in vast numbers to the Union volunteer soldier in 1861. "The M1816 flintlock musket played a temporary though highly important role during the early years of the Civil War, and filled a gap which, left unfilled, might well have altered the [war's] outcome" (4). The weapon must be described as in overall very fine condition. It is missing the ramrod, but it shouldn't be too difficult to come up with an accurate replacement