Mystery Solved! Merz Werke it is!! Merz Werke was hired by Erma to improve the production process, (transition of MP38 to MP40). They were experts in stamped steel production processes. Their main business was making typewriters. See the photo of a 1932 Merz Typewriter. The symbol is the same. So this is a wartime stamping. I wonder where else it may turn up in wartime productions?
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