2005 D And 2016 D Pennies, A Strange Pair With Unplated Zinc Mint Errors?

I am not aware of any mechanism where only a partial copper plating could occur.

Leads me to believe both of these coins have experienced environmental toning/staining of some sort before you found them.

This type of thing comes up a lot here. Some say PMD some say a plating issue.
John1

Most like just ED.



to the CCF!

I'm going to go against the grain here, like I always do on these cents. This is a plating problem. I found about 2 rolls of 95s that have from some to almost all of the plating missing in uncirculated String & sons rolls. If I hadn't found them in unc. rolls, I'd probably agree this is PMD. But finding them in uncirculated rolls tells me that they were like this from the mint. This is a pic of some of them.

Coming out the same roll is strong evidence of mint error I think. Are they worth anything?