4" barrel, 9mm caliber. Chamber area dated 1936-1940. There is a stock lug. Extractor and safety marked. In 1937, rust blue process was eliminated entirely and all subsequent pistols were salt blued. Many thousands manufactured with one- to five-digit serial numbers—some with letter suffix. NOTE: Rarest variation is early 1937, with rust blued and strawed parts, add 20 percent.