With no visible relief, and a somewhat fuzzy photo, it's impossible to help you.
We don't see the other side, no clue as to metal content, no size measurement...
No story about the type of area it was found-
Perhaps try a psychic site for identification?
you cant see the face?Yea I have seen these on here before too, it is a worn out copper with nothing left to ID. seriously, I don't see any detail at all.
If that is a Reeded Edge that I see on it, then it is likely a coin but in it's current condition, it is all but impossible to identify. Try a heated Peroxide bath on it to see if some of the encrustation/corrosion can then be removed to reveal some images and/or letters. After that, you might try soaking in Mineral Oil or Extra Virgin Olive Oil for a few weeks of more, then pick away as much encrustation/corrosion as possible once removed.
Frank