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<p>[QUOTE=&quot;John Burgess, post: 3654352, member: 105098&quot;]My opinion is that it&#039;s Progressive indirect die transfer (PIDT) and that the toning is just making it more easily observable at this point. Which would be commonly called &quot;ghosting&quot; or less commonly called &quot;internal metal displacement phenomenon&quot; (imdp).</p><p><br /></p><p>This generally happens on coins struck with a late die stage die. and would be considered die deterioration.</p><p>It&#039;s a bit common on 40s to 50s S mint coins</p><p><br /></p><p>Now as far as value goes... no. There&#039;s no added premium to the coin for it. It&#039;s an oddity that shows up on coins struck by worn dies.&nbsp; I&#039;m willing to bet the obverse side is really strong and the reverse is weaker in comparison. Maybe they used an older reverse die and a new obverse die together? It&#039;s interesting and it&#039;s an oddity, but as far as collector interest is concerned, any one of any year would do for an example so they pretty much have the entire history of Lincoln cents to go through to find an example if the want one, it&#039;s not collected by dates or anything and once you have one... meh.. lol</p><p><br /></p><p>Someone more knowledgeable than me in this area may be able to tell you if there&#039;s a premium for a proof coin that exhibits this, since generally proofs are stuck more carefully and less of them, but from what I know it adds no value because to get an example of it, if a person wanted one, you wouldn&#039;t need a proof coin for that and as I said they happen frequently enough as part of die wear progression.</p><p><br /></p><p>Although I suppose if a handful to a dozen of collectors wanted to build sets of PIDT coins and an example of each year for their set a premium would have to occur, and they would fight to get them at that pint and pay more... I&#039;m not aware of this particular situation existing in the market though. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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