It's a struck-through error, probably through a viscous liquid, like oil.
Struck-through refers to something on the planchet or die at the time the coin is struck. An impression of the struck-through obstacle is left on the coin.
Lamination refers to an alloy mixture problem that causes parts of the coin to flake off in layers. Sometimes this happens before the strike and sometimes after. The result is what looks like part of the coin has been peeled away.
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