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Message:: [QUOTE="Insider, post: 2337976, member: 24314"]Not convinced. First link so, so.  I have been told that Mike Diamond runs the second site and he is a very informed error guy.  So for now, I'll need to find out for myself. The causes of this type of error was described to me many years before clad coins existed.  Mike covers that.  Nevertheless, I never heard the term "blistered plating" in the early 1980's either.  So all this terminology must have resulted from new research.  I have not seen this effect on a clad blank.  I need a better explanation!  None of the genuine coins I've seen with this characteristic has been heated OUTSIDE the mint - including the OP's coin.  IMO, when genuine, it has to occur during striking.  If the error guys want to call it "Blistered Plating" that's OK with me.  I wish to know what caused the blister.  Trapped gas in the clad layer that was heated during striking would = occluded gas?  Yes? No?[/QUOTE]