Now this is an interesting find, and something I know next to nothing about. I think I have the correct ID though, but feel free to correct me please: What info I have is this:
The antiquities folks are gonna have a problem with this. Tell your son to mingle this with his pocket change when he wants to come home.........
That's a long way off. He just got stationed in Belgium on a 5 year assignment (his second time there).