Damned if I know what it is!

We did some painting, and in the process of clearing out the room I came across a long-forgotten stash of coins. Why we put a bunch of euros in a pottery jar I have no idea. But this ringer was in there with them, and while I suppose it is from Asia, that's as far as I got in my numismatic investigation.

The coin is a bit worn, although it isn't in an alphabet I can read, so that doesn't really matter. And it's a fair bet that it is worth about 12 cents, so I am not counting on it for retirement, but I sure would like to know what country it's from and why the hell it's in my house!