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<p>[QUOTE=&quot;furryfrog02, post: 7502054, member: 41219&quot;]This is from <a href="http://www.error-ref.com/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/" rel="nofollow">http://www.error-ref.com/</a> </p><p><font size="6"><b>PART IV. Die Errors:</b></font></p><p><font size="6"><b>Die Deterioration / Deformation errors: </b></font></p><p><font size="6"><b>Die Deterioration Doubling</b></font></p><p><b>Definition: </b>Die deterioration (die wear, die fatigue) sometimes produces discernible doubling of affected design elements.&nbsp; We call this die deterioration doubling (DDD).&nbsp; Its appearance is highly variable.&nbsp; It is often <b><a href="http://www.error-ref.com/die-deterioration-doubling-raised/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/die-deterioration-doubling-raised/" rel="nofollow">raised</a></b> but can sometimes be <a href="http://www.error-ref.com/die-deterioration-doubling-incuse/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/die-deterioration-doubling-incuse/" rel="nofollow"><b>incuse</b></a>.&nbsp; Incuse DDD is most often seen on copper-plated zinc cents, but does occasionally appear in other issues.&nbsp; Die deterioration doubling may completely surround an affected design element (like a number or letter) or may be restricted to one side.</p><p><br /></p><p>The images below shows die deterioration doubling on a 1955 Lincoln (raised), Jefferson nickel (raised) and 1989 Lincoln (incuse).</p><p><br /></p><p><img src="http://www.error-ref.com/wp-content/uploads/2013/12/54795590.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><br /></p><p><br /></p><p>As to <u><b>why</b></u> it causes it...I honestly don&#039;t know.[/QUOTE]</p><p><br /></p>

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