With no lettering or identifying markings of any kind, It will be very difficult to track such a thing down. I'm not even sure it's numismastic-related; it might be a piece of jewellery or something else.
It probably won't help, but how big is it?
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis