I just inherited my great-grandfather's coin collection from my dad (lots of really cool things). But this coin is labeled as “Luxembourg 1681?” and I can't find anything on it. Is it a fake/souvenir that has gotten mixed into the collection. Clearly my dad or grandfather couldn't find information on it either, but I have no idea where it was purchased. It's about the size of a US half dollar or large British penny from around 1920.






