4" barrel, 9mm caliber. Has a stock lug. Extractor and safety are marked. First Luger that utilized codes to represent maker and date of manufacture. Front toggle link marked S/42 in Gothic or script; this was code for Mauser. Chamber area stamped with letter "K" code for 1934 year of manufacture. Approximately 10,500 manufactured, with one- to five-digit serial numbers—some with letter suffixes.