This Winchester Model 1866 carbine has the serial number stamped in block numerals behind the trigger. The special order rifle style stock has the matching partial serial number "8177" stamped in the upper tang inlet and a nickel plated rifle buttplate with trapdoor compartment. "2277494" (significance unknown) is non-factory stamped on the left side of the nickel plated receiver. The barrel is marked with the two-line address and King's improvement patent marking (faint). It has a "pinched" blade front sight on the front barrel band and folding leaf rear sight. The forearm is the carbine style with a single barrel band. A saddle ring and staple are on the left side of the receiver.