Hamilton Model 51, .22 short and long cals. single shot bolt action rifle.  Serial #NSN.  Fair condition.  20" barrel has good rifling with frosting and some corrosion, fixed sights.  Blue finish on the underside and the top is coated in rust.  The action works.  Smooth wood stock is in good shape with impressions and scratches. Stock designed without a butt plate.  Many a young boy learned to shoot on one of these.  C&R OK.