Old Worn Copper Coin?

[Nezazor]

Hey guys. I'm having real trouble IDing this coin that I found. It is extremely worn and seems to be quite old, perhaps my oldest( I hope). Do you guys know what kind of coin this is? You can sort-of see a monarch in the pictures. The other side of the coin is complete corroded. Thanks!

 

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[mick56]

It would help to know the diameter in millimeters. Even then, I don't know if it could be i'd.

 

[Beshires1]

Look at my last post in the worn Merc thread.