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<p>[QUOTE=&quot;Oldhoopster, post: 2943500, member: 84179&quot;]I agree with it being a plating blister or zinc corrosion.&nbsp; It took the blank/planchet suppliers a few years to work out all of the bugs in the plating process, so blisters are very common on cents from the 80&#039;s</p><p><br /></p><p>Corrosion can start in any small/microscopic breech in the copper plating and can continue under the plating surface (think of rust forming under paint). </p><p><br /></p><p>Take a look at your coin.&nbsp; There are a lot of dark areas and discoloration.&nbsp; This indicates that it probably spent some time in an environment that was not friendly to reactive metals (copper and zinc like to react with a lot of things).&nbsp; It doesn&#039;t take much exposure to start corroding the zinc. </p><p><br /></p><p>A good general rule when searching for error coins:&nbsp; The more circulation damage&nbsp; (discoloration, corrosion, scratches, etc) the less likely the anomaly that you see is a genuine mint error.&nbsp; Not to say that you can&#039;t find something on a beat up coin, it&#039;s just that you need a lot of experience to differentiate between the damage and the error.</p><p><br /></p><p>Hope this helps[/QUOTE]</p><p><br /></p>

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