I went through a box of pennies and found a couple interesting ones. This 1989 D doesn't seem to have doubling to me, but seems as if the planchet drifted when the DIE struck. Hopefully you can see what I'm describing. It is most prominent on the reverse. (Didn't have the best scope or camera) I'm really curious as to what caused this, I did see the same thing on another '89 D online, but very minimum on the Mint, also, the collector was worried about the doubling more than anything else. If anyone could identify the cause I would greatly appreciate it.
As I was searching for around for what you mentioned I found abother forum on a similar coin, but they mentioned it being "Zinc Rot" if that is so, how it is possible for it to rot in the specific sections where doubling would appear.
It's not zinc rot, but the zinc will someday begin to oxidize because it is now exposed to the elements. When the dies strike the planchet, the copper plating has to stretch. That sometimes puts enough stress on the plating to actually break it. Sometimes that looks like doubling, but it's not.
Thanks a ton. I'm still keeping it in my collection of course, anything other than what the Mintage intended is a valuable error to me.
