On the obverse, just below the D mintmark. And on the reverse, several areas on the surface.
I assume the mintmark affect is perhaps from metal getting pushed up from the stamping? it is a fairly pronounced "wave", so to speak.
The reverse, I assume these are delamination perhaps from gas bubbles underneath which burst through, or defective plantchets? About 4 areas affected on the reverse.
Like you said it probably started out just having some torn plating by the mintmark and bubbles on the reverse but the zinc is so reactive it corroded and burst through.
Oxygen/air finds those areas where the plating is torn or bubbled and the corrosion grows on the zinc in those areas and pushes the plating off and dissolves the zinc and makes holes. _________________ Ed
I've got two 1983-D Cents that the mintmark has completely fallen off the coin with the hole in the plating. It happens on the sriking that the plating gets a hole in the plating and the air works on the zinc. I can't image how these will look in years to come? the thought of a Hershey's kiss foil comes to mind. The zinc will completely deteriate away leaving the skin.. _________________ Richard S. Cooper
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