.54 caliber. 21" barrel. SN: 9565. Blued and color casehardened finish, smooth oil-finished walnut forend and stock. Single shot percussion breechloading cavalry carbine with aperture leaf rear sight, pinched front sight blade, saddle bar and ring and sling swivel in toe. Top of chamber marked in BURNSIDE PATENT/MODEL OF 1864 over the serial number, breech block with matching serial number. Left wrist with two clear script GC cartouches, the mark of Springfield Arsenal civilian sub-inspector George Curtis. A small HDH block inspection is present on the bottom of the forend, the mark of arsenal sub-inspector Henry D. Hastings, whose cartouche often appears on 5th Model Burnside Carbines with Curtis'. This carbine is from the Collection of Charles Worman, co-author of the two volume set Firearms of the American West.