Ruger New Model Blackhawk, .30 Carbine cal. single action revolver.  Serial #51-06746.  Excellent condition.  7 ½” barrel has excellent bore, ramp front sight and adjustable rear.  Barrel and frame have 96% blue.  Cylinder has 95% with light index marks.  Ruger smooth walnut grips are excellent.  Single action works fine with tight lock-up.  Unusual caliber!