Mint mark error?

I have this 1987 P quarter, been looking at it for ages, in Washington's bust, there appears to be what is shaped like an additional "P" imprinted. I took son pictures, and I apologize if they arent the greatest of quality. But it's just hard to tell if this is a strike error, or post print type of thing.

 

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Sorry, but it's not a mint error. Just a dent in the coin that probably showed up with the rest of the dents and dings

 

Coins are struck not printed.. Paper currency is printed.

 

You get the idea...