Hello Thomas, and welcome to the forum.
Congratulations on your 1900 Luger, and thank you for posting pictures.
The DWM worker department inspection marks came in quite a variety of shapes and patterns. The one you mention is known, as described above...
If you should be interested, contact G.T. (Gerald) on this forum about repairing the base of your magazine. He's an expert, and does beautiful work.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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