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<p>[QUOTE=&quot;Oldhoopster, post: 3422066, member: 84179&quot;]Possibly dirt/contamination in the plating bath that adhered to the coin during the plating process or dirt/dust/junk still stuck to the planchet when it was plated.&nbsp; Over time this stuff could be an initiation source for corrosion and that&#039;s why you see a raised area after striking&nbsp; This is a 1983 coin and the mint supplier was still trying to figure out the high volume plating process.&nbsp; I agree with [USER=86437]@Fred Weinberg[/USER] that it&#039;s not a typical plating blister and isn&#039;t considered an error[/QUOTE]</p><p><br /></p>

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