While there's no way to say what caused this, it's just Post Strike Damage (PSD.) Chances are that when it left the mint it was normal. To verify that it's just damage, check the weight. I think you'll find that the coin is well under the target weight of 5 grams.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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