Unknown little coin

Dear All,

I wonder if you could help me to identify this coin in horrible shape.

I have no idea where to start.

Any suggestion will be highly appreciated !

Regards,

Andrej

Is the hook part of it or attached later? It looks like it could have been original which would make this a decoration not a coin. If you aren't sure provide good images of that connection.

If the hook was attached later please provide the weight and diameter of the piece.