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<p>[QUOTE=&quot;Clawcoins, post: 3155878, member: 77814&quot;]&quot;Notching&quot; vs &quot;Shelf Like&quot; I think are the terms that need further definition.&nbsp; You may want to research that.</p><p><br /></p><p>If you look at the bottom of the O</p><p>[ATTACH=full]809271[/ATTACH]</p><p>you can see the slightly reduced size of the bottom curve of the O, while it has a slightly wider total width than it should be.&nbsp; It&#039;s like someone put a nice &quot;curved height&quot; O on top of a flat O.</p><p>The &quot;extended&quot; part of the bottom of the O looks flat and shelf like, no notches.&nbsp;&nbsp; That is indicative of machine/deterioration doubling.</p><p><br /></p><p>read this==&gt; <a href="http://www.lincolncentsonline.com/mechanicalDoubling.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.lincolncentsonline.com/mechanicalDoubling.html" rel="nofollow">http://www.lincolncentsonline.com/mechanicalDoubling.html</a></p><p><br /></p><p>==&gt; <a href="https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling/" rel="nofollow">https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling/</a></p><p><br /></p><p>I try to think of &quot;notching&quot; as a separate part of the letter altogether that has the same heights and curvature of the height of the letter as the original letter but *not* sitting underneath it.&nbsp; It may not be true DD but it is indicative of it, and separates MD/DDD from the identifiers of true DD.&nbsp; As shown by the last 2 examples here ==&gt; <a href="https://www.errorvariety.com/OFD/DDD.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.errorvariety.com/OFD/DDD.html" rel="nofollow">https://www.errorvariety.com/OFD/DDD.html</a></p><p><br /></p><p>And conversely I try to think of MD/DDD as a &quot;shelf&quot; of the letter which may not be smooth formed around the edges with a properly formed letter on top of it.</p><p><br /></p><p>I think that is a simplified concept but maybe easier to understand.</p><p><br /></p><p>Here&#039;s the bottom reverse of a 1985 D penny without any anything for comparison.</p><p>[ATTACH=full]809273[/ATTACH]</p><p><br /></p><p>It&#039;s a long learning journey.&nbsp; Best to buy a real Doubled Die coin so one has it in hand for comparison.[/QUOTE]</p><p><br /></p>

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