1985 P Penny Plating Error

The images are not blurry. This is what the entire surface of the coin looks like. What caused this?

 

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Worn die plus grease is my guess. Let others chime in

 

Greaser but where does all grease come from ? Is it from a polished Die ? Anyone know ?

 

@Conder101 knows.

 

Here is a brief explanation
https://www.error-ref.com/struck-through-smooth-viscous-material-grease-oil/

 

http://www.error-ref.com/blisteredplating/

i think.

 

Exactly my first thought.