Please help me identify this coin

I found this in a lot of uncleaned Spanish coins. I've since cleaned it. Most were from the 17th Century. It's the right size for 8 maravedis and appears to be countermarked with the numeral 8. Thanks for any help attributing it.

 

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Spain.
8 maravedis. XVII century.

 

Here are what I hope are some better pictures.