The rectangular welding spots are characteristic for magazines produced by Erste Nordbohmische Metallwarenfabrik (ENM). JVD is the secret code assigned to ENM and this company used the inspection stamp E/WaA706. Magazines of the 4th type were stamped with the ENM code jvd and with the ENM Waffenamt E/WaA706 on the spine. The jvd stamp also was applied on the left side of the magazine housing. These magazines were issued with some Mauser (byf 44) pistols and with Spreewerk (cyq) pistols.