One other explanation may be that this is a loose piece of copper that is adhered to that spot. If you take a toothpick and try to flick it off you may have your answer.
Coppercoins What exactly is a lamination peel? When I shine the light on the left and get the "negative" look it is punched onto the coin, like a letter is. Do you have a website where I can learn about this?
A lamination peel is a loose piece of the planchet that folds back onto itself after the strike. Like a folded back piece of foil. They are somewhat common and usually don't bring much of a premium unless they are substantial.
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