Most, if not all, Mauser Military Magazines were made by Haenel. Your center pin bottom was introduced as a 122 magazine in the 1940 Lugers. The fxo magazines didn't show up until the 1941 production.
The proper magazine for your Z-Block 1937 is side pinned, with a Waffenamt Stamp SE/63 AND a "Z" suffix.
Hope this helps!
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