Smith & Wesson Model 18, ".22 Combat Masterpiece", 22 long rifle cal. double action revolver.  Serial #K433376, mfg. 1961.  Excellent condition.  4” barrel has excellent bore, ramp front sight and micro-adjustable rear.  Barrel and frame have 93% blue with light muzzle and edge wear.  Cylinder has some flute and index wear.  Case colored trigger and hammer.  S&W checkered diamond grips show some wear, have matching numbers.  Double action works fine with tight lock-up.  Hard one to find! C&R OK.