The Springfield Model 1861 rifle-musket was the primary shoulder arm used by the Union infantry during the Civil War. Most of these Model 1861s saw heavy use in virtually all of the major battles of the war. Marked "U.S./SPRINGFIELD" at the center of the lock, as manufactured by the Springfield Armory, ahead of an eagle and shield and the date "1862" at the tail of the lock to match the "1862" dated barrel. Front sight doubling as a bayonet lug and blued rear sight with 100, 300 and 500 yard flip-up leafs. The left stock flat is stamped with two boxed script inspection cartouches including "ESA" of Springfield Armory's Master Armorer, Erskine S. Allin. "US" and "H/32" marked buttplate tang.