2015 D Sheild Cent odd strike on Reverse.

Hey found this on in pocket change. Funny looking on reverse, can anyone explain this one to a newbie please?

Thank You.

 

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Whatever happened to it,
it happened after the coin
was in circulation.

Looks stained, possibly flattened somewhat.

It did not leave the Mint like that.

 

Not an error, maybe somebody dipped it in something?

 

Thank You Sir, well I was hoping anyway, would be my very first. Have a good day. ( back to the hunt).