Chinese/Japanese Coin???

[kkbroker]

Anyone seen one of these? It registered 78 on my Garrett AT Pro

 

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[kkbroker]

It is about the same size as a quarter

 

[sagittarius98]

It is a Chinese cash coin. Your coin seems to have bubbles, which could suggest a replica. These are replicated for jewelry, they aren't valuable.

It looks like it is this type:
http://www.calgarycoin.com/reference/china/china8.htm#kang hsi

 

[Bigcypresshunter]

If it was real it would be 1662-1722 but I agree with sagitarrius, it looks funky.