unidentifiable

Hi treasurenet, I need some serious help with this one. It was found in a sandy field next to a very small creek in Oconto county Wisconsin. It seems to be copper as it has patina and is non magnetic. I found a copper nugget a year ago near this one. I was assuming it is native copper culture...

I found this coin in a field in Luxembourg (Europe.) I have found items in the location dating back to the 1600s and up to modern times. It is made of copper and has a diameter of 25mm. The only detail I can make out says 1907 (shown in 1st and 3rd pictures.) Any info on what type of coin this...