4" barrel, 9mm caliber. Area above chamber has two dates: original 1910-1918 and date of rework, 1920 or 1921. Extractor and safety are both marked in German. Model can be found with or without stock lug. "ERFURT" under a crown is stamped on front toggle link. Police or military unit markings are found on front of grip straps, more often than not. Thousands produced by DWM as well as Erfurt.