Manufactured 1962-1963. With a ramped Patridge blade front and fully adjustable rear notch sights, a detachable muzzle brake, and two detachable weights on the underside of the barrel. Overall markings are standard, with "US" on the frame below the model marking. Fitted with a pair of checkered medallion grips. "U.S." stamped under the model markings on the left of the frame otherwise standard markings and checkered contoured grips with inset Hi-Standard medallions.