This is an original Civil War M1855 socket bayonet issued to fit the US Percussion Model 1855 Springfield Rifle, as well as the M1861 and M1863 rifled-muskets. Blade surfaces are in good condition with an overall dark brown patina. “U.S.” stamp present on flat of blade. Bayonet barrel is stamped with “E436″, likely a post-war rack number. Blade measures 17-7/8″, overall length 20-7/8”.