What kind of error is this?

I'd like to get everyone's opinion on this 1985 D error. What kind of error is it, a cud, or die chip, etc.?

Thank you all.

 

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Take a or a tooth pick and gently press on it. If it flattens then it is a gas bubble from the zinc rotting underneath. If it is solid then it is probably a die chip.

 

It's a Non Mint Error - Classic Zinc Deterioration
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