Ruger Revolver Model Single Six, 3 screw .22 caliber with additional .22 magnum cylinder. This is classed as a Curio. As new condition, 6 1/2" barrel and adjustable sights. Was sent back to Ruger Factory for safety upgrade and returned with yellow box and old model parts in Ruger bag. Has no prefix to six digit serial number, with all papers. Nice old collector gun or shooter, FFL required.