I have a good idea it's not a stain only because the pattern seems raised compared to the darker parts of the reverse. Will try and get different angles on the coin. I would try to clean it but don't have acetone or cleaner(the alarms are going off in my head just typing that)
I'm thinking it's a 'cup holder' coin as well. Whatever caused the stain could have etched the copper surface as well. I worked in a QC lab for Coca-Cola and saw what the acid can do in it's strongest and weakest solution. A little copper doesn't stand a chance.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
So where did we end up on if a zincoln can even have a lamination or not? I thought I read it is not possible. Hermz,your coin looks like a so called cup holder coin to me. John1
That's good to know John, I didn't realize that! I can accept the cup holder idea. Just a first time for me seeing it corrode a pattern like that into the coin I suppose.
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