What do you call this type of error? At first glance I thought someone had damaged this penny, but the bubbles are under the writing not on top. Is this cause by gas being trapped or to much heat of some sort?
This is yet another example of the inferior production of zinc cents: 8 years later the contractors hired by the Mint still had not gotten the proper production procedure ironed out. The first zincs were begun in July 1982, and many had copper plating imperfections…just like this one. Oh, and BTW, there is no added value for this production defect…imo…Spark
A lot of collectors don't like these blistered cents. And a majority think that they are gonna explode and have zinc rot in no time. It is simply not true. Also, most think that a coin with blisters can't grade very high, and shouldn't be Gem or above, also not true. There are a few years that these blistered coins hold the top pop, MS67 and above. PS, 1990D is not one of them.
It’s all plating blisters. The coin is zinc and a very thin layer of copper covers the coin. It’s terrible what the mint is producing today and this is quite common.
Terrible. That zinker's a real stinker. They'd be better off just making them out of one material. One yeners in Japan hold up 100% better compared to the 83' and newer US Penny. I don't think the two metal's stay together well over the test of time.
I have never had a post 82 cent degrade when in a controlled environment. It is everyday use that degrades the coins, cup holders, ground, etc.
