.45 ACP. 5.5" barrel. SN: 16806. Blued finish, smooth walnut grips. Double action revolver with fixed frame notch rear sight, blade front sight, swivel lanyard ring in butt and fluted 6-chambered swing out cylinder. Two-line barrel address and patent information on top and COLT D.A. 45 on left side of barrel. Rampant Colt on left rear of frame and a circled GHS Gilbert H Stewart inspection is present on the upper left rear of the frame. Butt marked U.S./ARMY/MODEL/1917.