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<p>[QUOTE=&quot;Pickin and Grinin, post: 3513957, member: 73995&quot;]Plating blisters like this are common on all the early zLincolns. The mint was having a problem bonding the copper plating to the zinc core. IMO it really doesn&#039;t have anything to do with corrosion or any kind of elemental exposure.</p><p>This is the way a lot of the cents looked, some of the cents are covered on all the reverse and the whole reverse. </p><p>We can also look at this another way. Most of the cents that do not show this are usually early die state coins. As the die began to wear, the metal flows differently and thus would cause more problems with the thinly bonded copper plate.</p><p>Most of the coins that look like this either blisters or linear blisters are late to fully deteriorated dies. </p><p>Just my two cents. I have not done the full research.[/QUOTE]</p><p><br /></p>

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