If I remember correctly, the Haenel - Schmeisser facility that made the "fxo" marked E/37 accepted magazines (the milled welded steel ones) was the same facility taken over by the socialized Ernst Thalmann organization in East Germany after WW-II in Suhl.
The Thalmann mark was 2/1001
https://forum.lugerforum.com/attachm...1&d=1703111629
There is a discussion of the company at:
https://en.wikipedia.org/wiki/C.G._Haenel
Made this thread a "Sticky for the reference information...
Also see additional notes from GT on MecGar magazines:
https://forum.lugerforum.com/showthread.php?t=40440
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.