What would cause this?

jjamis23

I'm new at coin collecting (I'm sure that's obvious from my question) I've got a few 1996 D pennies. All are in great shape. Two of them stood out to me. The two look like they have a different finish. Under the microscope they are the only ones that have this. Thanks for looking.

Morgan White

Greenstang

Welcome to the forum
Please do not use screen shots, they are too pixilated to see fine detail properly.
Also always include a photo of both sides of the complete coin when posting.

The finishes would be the same when they left the mint, any difference would be
from circulation and environmental toning.
Hard to tell anything from those photos but my guess is that there is split plating
where the zinc core is showing through the copper surface.

Coins3675

Hard To Tell With Your photos.