Took the Explorer for a walk today, after digging pull tabs and junk for an hour decided to head home, right before I turned the detector off I got this deep signal. This was down 15" in a dried up lake. It is copper, a little bigger than a half dollar and a little smaller than a silver dollar. I thought it was a token but after washing the dirt off I see the bust of a head on the front with a couple letters faintly visible, I cant see any date but there is some kind of small head on the back similiar to a seated coin. Is there anything I would be able to do to get some ideas? Thanks for any help. Happy Hunting!!