I just thought I would share a couple of pictures I took of two pennies I found which are missing some of their plating. These are my first pennies like this.
Ironically... I found this one right after I created this thread. I figured I might as well post a picture of it too. It is missing nearly all of it's plating.
I agree @paddyman98 stained/environmental damage. From 1982(I'm only talking about the copper plated cents here) they used a zinc blank, your coins are not showing any zinc and I can pretty much be certain they weigh correctly also. I have a bunch of water/chemically damaged coins in a container that look just like these.
