Manufactured in 1938, the first year of production. Blade front and adjustable rear sights, with "U72" stamped on top of the slide, and in electric pencil on the barrel and chamber, the two-line address and patent marks on the left of the slide, and the model nomenclature and diamond logo on the right. A full-blue Colt Ace Service Model magazine is included. Includes a correct unnumbered Colt factory maroon box, recoil spring, spring guide, plunger, slide catch, extractor, and the previously mentioned magazine.