Must be very late war. Very cool though. Worn on the lower left side of the uniform blouse, hence the pin.
Im thinking the same thing, late war period.
No makers mark I can see.
The makers mark is on the back of the pin, a single stamp of # "20" I researched it years ago but forgot who was the maker. Looking now, will update. Will post a pic too
Maker Mark https://pic8.co/sh/2woCR2.jpeg
20 mark is C.F. Zimmerman
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