1987 D Penny Could Someone Let Me Know If It Is An Error Penny?

Plating bubbles are common on 1980s Zincolns, it is caused by residual contamination left on the zinc blanks before they were electroplated. Once the plating bubble rupture, severe corrosion sets in. It are not an error and it is actually fairly uncommon to find one without plating bubbles.

Bio,
I asked this before but did not get an answer,if the bubbles are on the planchet why don't they get flattened out during the strike?
John1

The bubbles would take a bit of time to form and are most likely not typically present at the time of striking.

Another point to ponder (temperature change), would include mother nature or environmental conditions and metallurgical physics. Metal expands and contracts and not all at the same rate.

If a tight or permanent bond is lacking, I'd think one or the other will have to give over time. Thanks, Doug.

I asked the same question and got the same answer, gas bubbles at the time of strike, but I also read somewhere on this forum ( don't ask me where I have read so many posts my eyes hurt ) That there bubbles caused by heat and also bubbles caused by environment and zinc deterioration

Not an expert, so don't quote me, but have read many post on subject.

There is a heat or friction transfer at the time of strike that creates an "occluded gas bubble". Believe it to be caused by trapped air or gas. Very rare occurrence and hard to discern as it resembles a small die gouge in the examples I've seen.

Larger bubbles typically seen on clad coinage is a product of induced heat after strike. They raise fairly large lumps on one or both sides of a clad coinage due to trapped air or gas expanding.

Plating bubbles are as suggested. The thin layer of plating for what ever reason has formed a bubble from underneath the plating, between it and the host product. In the case of zinc plated cents, should outside air reach the inside cavity is a recipe for zinc rot to develop.




Just like in school I wish I had paid more attention. I don't recall seeing it early on, but then I wasn't looking for it back then either. Thanks, Doug.