Lincoln Cents 1970 D pre or post mint error?

Just found this and was wondering if this happened at the mint or not and how it happened. Ed

 

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I see a hit to the coin AFTER leaving the mint. Notice how the metal is pushed up as though a snow plow was driven across the coin. A die would not have those characteristics.

If a die could produce a coin like that, there'd be millions just like it.

 

Damaged, and recently. The metal underneath is still shiny.

 

Thanks all - thought maybe post mint damage. Ed