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<p>[QUOTE=&quot;Old Error Guy, post: 2252349, member: 66552&quot;]This &quot;discussion&quot; shows a very limited and somewhat inaccurate understanding of &quot;machine doubling&quot;. I&#039;m taking the liberty of borrowing from the preamble on the error-ref section on these coins:</p><p><br /></p><p><b>Definition:</b> This form of doubling typically results from vibration or instability affecting the die, die assembly, or press frame.&nbsp; It has also occasionally been blamed on a coin sticking to the anvil die during ejection (“ejection doubling”).</p><p><br /></p><p>Anyone genuinely interested in understanding what&#039;s going on would be well advised to check good references (here is one <a href="http://www.error-ref.com/machine-doubling/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/machine-doubling/" rel="nofollow">http://www.error-ref.com/machine-doubling/)</a></p><p><br /></p><p>Here is the section on die deterioration: <a href="http://www.error-ref.com/die-deterioration-doubling/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/die-deterioration-doubling/" rel="nofollow">http://www.error-ref.com/die-deterioration-doubling/</a></p><p><a href="http://www.error-ref.com/machine-doubling/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/machine-doubling/" rel="nofollow"></a>[/QUOTE]</p><p><br /></p>

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