Large Military Pin/Button

[TXPlugKutter]

I found this today while looking through some stuff I acquired from my late grandfather. Does anyone know what this large of a emblem would have went on. I am thinking WWII since my grandfather was in it but I don't know for sure. I also believe that it is made of copper due to the patina/corrosion. Across the top it simply says "SCHREINER". The back uses a threaded nut to secure it to whatever. Also on the back at the tips of the each wing there is a small point, I also assume to help secure it.

Any info would be much appreciated. Thanks for looking.

 

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[PBK]

In that case, maybe it's their own cap badge and not an ROTC variant, but it's obviously modeled on the ROTC badge:

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[TXPlugKutter]

Very interesting, would this be considered rare or would it have value? I don't want to sell it or anything just put a story with the item. The best I remember, all of my family that went to war didn't have any college but they could have been part of the ROTC.