Could be postwar replaced (most likely); original to the tunic and the tailor was all out of WH buttons at the time; or the Officer was also a Party member who wanted his troops to know it:
https://www.ebay.com/itm/Wehrmacht-U...53.m1438.l2649 s-l1600.jpg
https://www.ebay.com/itm/Wehrmacht-U...53.m1438.l2649 s-l1600.jpg
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