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If thats the case wouldn't this look the same as when it was struck?
I don't believe it would since the die wouldn't have had these bumps on it. IMHO, the flat areas of the field and smooth areas of the devices would still make the coins appearance look the same after minting. I think dust may have interfered with the copper bonding to the surface of the zinc, allowing the copper to pull or be pushed away over time, or the zinc to decompose under it.
EDIT: I just noticed your last image seems to show the bubbles arranged in a linear pattern over Lincoln's face. This linear pattern makes me think these "bubbles" are roller lines in the underlying zinc that is decomposing unevenly.
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Edited by Petespockets55
05/27/2020 09:01 am