Here's another mystery coin I found in a box of "stuff" around here. it appears to be silver, is very thin and about 15mm in diameter. I'm not even sure if the right hand photo is right side up or not. Any ideas? Thanks, Mike.
Hungary, Mathias Denar, 161x AD. The centre of the right picture shows Madonna with Child. Year to the left of this.
That's the small arms of Hungary by the way. The KB to either side of the shield is the mint mark for Körmöcbánya (now Kreminca, Slovakia).