1983 penny with unique weight and color? [gelöst]

Any thoughts about the heavy weight and unusual color??

Your coin has been plated with something probably brass or your scale needs calibrating.

Thank you. 👍

Got it graded now it appears to be a mint error of plating with brass 

not copper.

Any idea how much the brass plating adds to its worth?

Zinc blanks are plated with copper by a private vendor for the Mint. Tens of thousands zinc blanks get plated in the same bath at the same time. How is it possible this is a unique coin (or did the mint accept a large batch of blanks overweight and the wrong color)?  And how is it possible it would weigh more if a brass plating tank were used instead since the weight of the plating should be the same.  I think NGC is Looney Tunes on this one.

Edit: OK found this and this so looks legit.  Not really brass plated but plated in a contaminated copper plating bath.

ok, so brassy plated is a thing. 

I think I might have saved some such. unusually bright and eye appealing pennies I sometimes chuck in a certain drawer.

I bet a spectrum of brassiness could be lined up.

Thanks to all. 

I learned a lot.🥸

Just to add that brassiness is also found on solid planchets. The following on the right could well contain too much zinc.  But it also could be caused from environmental conditions. Unfortunately, no way to certain without destructive analysis.

Also, easy to create your own.

Excellent point. Look at the Morgan dollars with ‘rainbow’ toning.