Ruger Mark I, .22 long rifle cal. auto pistol.  Serial #10-04918.  Very good condition.  6" barrel has very good bore, fixed sights.  90% blue finish with high edge holster wear and light pitting on the right rear of the frame and the grip straps.  Black eagle Ruger checkered grips show some wear and the grip screws are marred.  Factory magazine is in very nice condition. Nice early Ruger.