It looks like a linear plating bubble. The copper plating has separated from the zinc core and left this raised area. You may be able to depress the feature with the point of a wooden toothpick.
This happens from time to time on zinc core coins. It doesn't add any value to the coin.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
If so it will depress under a toothpick. But if not, then it maybe something under the plating. But it is not a die issue/gouge. The location is not an area where this would happen. The weight of the coin could be normal. 2.5 grams
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