Need help on this Chinese coin

I need help with this coin. It's written "China" on the bottom of the protector but it's really worn out to make out. Any ideas?

 

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What does the other side look like? Tough to tell when you are only working with one side of the coin. It kind of looks like this: http://en.numista.com/catalogue/pieces21487.html

 

I can get a picture of the reverse when I get home but it may do no good. It's very worn on the reverse.

 

Judging by its diameter, it's too large for a 10 cash. More like a 20 cash.

 

I dunno...I googled "china copper dragon coin numismedia"