1985 D Penny Mint Error?

I feel this is done with a cigarette lighter heating the coin. There are partial plated coins, but they have a fading color on them:




Sometimes the plating is either removed or re-coated with zinc. There are several YouTube videos about this.

But the real examples of un-plated zinc cents, found have smooth surfaces are the real deal:

So if you see the surface gray in color and there are the appearance of plated over zinc dust, then you should assume that these were plated and was re-coated with zinc.

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