Any idea how old this coin is?

Its pretty beat up. No idea on it. Knowledge is greatly appreciated.

 

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You might start here and move on:
http://www.calgarycoin.com/reference/china/china8.htm#chien lung

 

China, Kangxi emperor (1662-1722). Your first photo (which gives the name) is upside down. The reverse gives the mintmark (in both standard Chinese and Manchu script) but I'm having trouble reading it. Not worth much in this condition, but a neat find nonetheless.

 

Thanks for the knowledge. Good day to you all.

 

kangxi bao "Guang" guangzhou mint. This is the small variety, so a pretty common coin, not worth much.