1987 d error

Hey all first of all i am not sure if this is an error at all but my mind is pointing to no but i dont know if all of you may have some knowledge to make it authentic and otherwise brighten my sickly day.

suspected zinc with no copper plating

 

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Seen a ton of them, sience project penny

 

PMD = Post Mint Damage.

Yours is environmentally caused. Chemicals, moisture, reactive metals, etc. Science experiment....maybe.

No added value, sorry

 

yeah figured as much just wanted to make sure thanks

 

thanks