I don't know if this is the right forum, but I couldn't really find one specific to something like this. I don't know if this is a spy coin (my father suggested this), a magician's trick coin, or some kind of error, but it probably shouldn't have been in my coin rolls.
As you can see, the reverse is missing and it's like the obverse is just a shell with bullseye-like grooves on the other side.
You might try to find a coin that will fit in the back and you can put it back to work as a magic coin. Possible English half Penny fit? Gold dollar? You might try a coin show with foreign coins. There might be one there that will work?
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