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
Nice medal. A great piece in any collection.
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