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<p>[QUOTE=&quot;Clawcoins, post: 3435592, member: 77814&quot;]there&#039;s 8 types of &quot;normal&quot; Doubled Dies ...</p><p><a href="http://www.error-ref.com/doubled-dies/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/doubled-dies/" rel="nofollow">http://www.error-ref.com/doubled-dies/</a></p><p><br /></p><p>excerpt top summary:</p><p><b>Definition</b>: A doubled die (hub doubling) is caused by a misalignment or a mismatch between a working hub and a working die.&nbsp; The misalignment or mismatch occurs between a first and subsequent hubbing or sometimes in the course of a single hubbing. Misalignments can occur along three orthogonal planes and three orthogonal axes.&nbsp; Doubled dies that are the result of a misalignment are variously characterized as rotated, offset, pivoted, or tilted.&nbsp; Doubled dies that are the result of a design mismatch are variously characterized as “distended”, “distorted”, “modified” and “design hub doubling”.&nbsp; A total of eight classes are recognized.</p><p><br /></p><p>******</p><p>There&#039;s also Master Die Doubling</p><p><a href="http://www.error-ref.com/master-die-doubling/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/master-die-doubling/" rel="nofollow">http://www.error-ref.com/master-die-doubling/</a></p><p><font size="6"><b>Master Die Doubling</b></font></p><p>Master die doubling resembles a minor doubled die (hub doubling), but instead of being restricted to a single working die, it appears on many working dies.&nbsp; The wide distribution of identical doubling can be traced to <a href="http://www.error-ref.com/doubled-dies/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/doubled-dies/" rel="nofollow">hub doubling</a> affecting the master die.&nbsp; The master die is the template from which many working dies are generated.</p><p><br /></p><p>When the master hub is pressed into the presumptive master die, several squeezes are required to fully transfer the images.&nbsp; Any shift in position between the master hub and the master die can result in doubling.&nbsp; The shift can occur between hubbings or even during a single squeeze.[/QUOTE]</p><p><br /></p>

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