Hello, this item is an original 1865 Spencer Saddle Ring Carbine, a lever-action repeating rifle developed during the American Civil War and manufactured by Burnside Manufacturing Co. in Rhode Island. Bearing serial number 3778, this model features a long barrel retrofit—likely performed post-war to adapt the weapon for infantry use rather than cavalry. The Spencer was a revolutionary firearm for its time, with a tubular magazine in the buttstock and a rolling block action, making it one of the first successful repeaters used in American military history.

Given its post-war adaptation, good overall condition, and desirable patina, this carbine retains significant historical and collectible value.