You will get better responses if you crop the extra and unused space from the background of your pictures. Start with full sized cropped pictures of both sides of the coin. Then full sized cropped close ups of the error. Before posting be sure to research your coin at error ref.com, varietyvista.com. You should be able to find the classification or category of the error. In your post include what you see that makes you think it is an error and what you found out in your research.
That is not an error of any kind. It's a copper plated zinc cent with post mint blisters due to long time exposure to saltwater or harsh chemical. The zinc underneath started to rot.
I just want to make it clear that the blisters on the Cent in question occured after the cent was minted. The website info you provided is on bubbles/blisters that occur before. There's a huge difference.
Not an error by any definition of the word. It’s a copper coated zinc cent that has blisters that’s causing the coin to rot.
I agree that it looks like corrosion. Monkey pox or what @paddyman98: would say soaking in a puddle of urine.
That's hard to say.. The cent could of been perfect for 28 years then a year ago it was exposed to something that caused the bubbles It really doesn't matter when it occurred. It just did.
I haven't seen a ban on mentioning cowpox yet. It is a relative of smallpox and used to be almost zero, but most thought smallpox was extinct and didn't need vaccinations, so it is spreading. Jim