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<p>[QUOTE=&quot;John Burgess, post: 3788999, member: 105098&quot;]Apologies guys I had really thought PIDT was common knowledge for most everyone on here since the majority of you are more knowledgeable than myself.</p><p><br /></p><p>PIDT is &quot;Progressive Indirect Design Transfer”</p><p><br /></p><p>When the hammer die (obverse die) strikes the <a href="http://www.error-ref.com/blank-or-planchet-2/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/blank-or-planchet-2/" rel="nofollow">planchet</a>, the force of the strike is transferred into and through the planchet and onto the opposing die (reverse or anvil die). Since the dies are slightly convex, the strongest force felt on the planchet is in the center of that planchet. However, in the case of the Lincoln cent, the center of the obverse die is incuse, so the area on the obverse die that experiences the first and strongest force is the field area immediately adjacent to Lincoln’s bust. Each strike transmits part of the force onto the opposing die. The area that transfers the most force onto the reverse die is the outline of Lincoln’s bust. This transferred force produces uneven metal flow in the reverse die, gradually creating a “ghost” image of Lincoln on the reverse die that shows up on the reverse of struck coins.</p><p>Progressive meaning it&#039;s a die deterioration issue.</p><p>Indirect meaning it happens through the coin planchet to the anvil die.</p><p>Die: should be self explanitory what that is.</p><p>Transfer: outline of Lincoln moves from the obverse hammer die to the reverse anvil die.</p><p><br /></p><p>It doesn&#039;t really happen much on thicker coins. The dies wear out or break before it happens but on the thinner coins there&#039;s enough force in the strike to tranfer the highest points of the design from the hammer die to the anvil die through the planchet. The thinner planchet don&#039;t absorb as much of the force as the thicker planchet do.</p><p><br /></p><p>Anyways. All good guys. It&#039;s a real acronym for a form of die deterioration/deformation.[/QUOTE]</p><p><br /></p>

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