Approximately 75,000 of these rifle-muskets were manufactured by Colt during the Civil War loosely based on the British Pattern 1853 "Enfield" rifle-muskets, and some of the design elements were later used on the Springfield Model 1863 rifles. This "1863" dated rifle-musket (both lock plate and barrel correspond) has the Colt Hartford address marking on the lock, eagle and shield emblem on the bolster, "V/P/eagle head" proofs, "F" and "STEEL" markings on the barrel, two clear script letter cartouches on the left stock flat, and "US" marked buttplate. Includes a "US/43" marked socket bayonet.