.54 caliber. 21" barrel. SN: 20176. Blued finish, brass furniture, walnut stock and forend. Single shot percussion dropping block with tilting breech breechloading cavalry carbine with military folding leaf rear sight, fixed front sight blade on base and saddle ring in receiver on reverse. Standard Starr markings on back action percussion lock and on barrel. Matching serial numbers on breech block and under barrel.