Smith & Wesson Model 1917 Commercial, .45 acp cal. double action revolver.  Serial #178280.  Good condition.  5 1/2" barrel has a very good bore with light frosting, fixed front sight.  Rear top of frame has been milled to accommodate adjustable rear sight.  60% finish on the barrel with most of the finish loss on 2" on the front of the barrel on both sides.  Cylinder has 70% finish with high edge wear and an index marks.   The frame has 40% finish remaining with heavy wear.  Matching numbers on frame, cylinder and barrel.  Wood checkered grips with diamond pattern are in good shape with some smoothness.  Lanyard ring present.  Double action works fine with tight lock-up.  Rarely seen commercial 1917! C&R OK.