Asian (Chinese?) Cast coin [Resolvido]

Hello, 

I recently bought this small coin mixed in with a bunch of modern ones.

As I know nothing about Asian coins, I need some help with the proper ID, if it turns out to be real.

Weight: 2.11g

Diameter: About 21mm

Thanks in advance!

Hello

something like this

N#37508

could be 22.620

Thank you very much for your help