We really need to start refering to these as "Plating Blisters". There really is an error "Gas Bubble" which happens on copper cents and is trapped gas in the alloy. Then there is "Subsurface corrosion" which will look similar, it is an upward push of corroding metal that when popped leaves craters. Here is Subsurface corrosion=
If you were to collapse this, a chasm would show. We do see this on Zincolns too.
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