Old is Gold

Greetings to all the members

My dear friends here is a picture of a coin which i found in my village field. This coin is worth of 50paisa (Pakistani currency) but now these coins are not used in my country. This coin is like a piece of Gold for me and i will keep it in at safe place.

Any one have experience of using it?My friends of Other countries have you seen this one in your country anywhere in trading?