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<p>[QUOTE=&quot;Clawcoins, post: 3202354, member: 77814&quot;]In brief and simplified:&nbsp; Something that is &quot;doubled (on the) die&quot; is when an image is accidentally duplicated TWICE on the Die itself.&nbsp; therefore, when a planchet is struck, it shows the doubled image on the die.&nbsp; ==&gt; <a href="https://en.wikipedia.org/wiki/Doubled_die" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Doubled_die" rel="nofollow">https://en.wikipedia.org/wiki/Doubled_die</a></p><p><br /></p><p>MD/DDD is when the die itself starts wearing out and the crisp edges wear down ==&gt; <a href="https://en.wikipedia.org/wiki/Die-deterioration_doubling" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Die-deterioration_doubling" rel="nofollow">https://en.wikipedia.org/wiki/Die-deterioration_doubling</a></p><p><br /></p><p>But recently the US MInt uses a single squeeze method which can created DDs itself.</p><p><br /></p><p>Also, many of the zinc lincolns (which are a super thin copper plate of a thick zinc core) are susceptible to blistering, tearing, etc.&nbsp; In the OPs coin you can see blistering underneath the bust.&nbsp; And there was a blister below the D that probably popped and thus you get something that looks like that. I&#039;m sure if you peruse ebay or google you&#039;ll find many examples of this in various locations.</p><p><br /></p><p>Here&#039;s split plating ==&gt; <a href="http://coinauctionshelp.com/copperplatingissues.html#.W7EftvZFx9A" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://coinauctionshelp.com/copperplatingissues.html#.W7EftvZFx9A" rel="nofollow">http://coinauctionshelp.com/copperplatingissues.html#.W7EftvZFx9A</a></p><p><br /></p><p>blistering .. just look through these threads ==&gt; <a href="https://www.cointalk.com/search/3799983/?q=zinc+blister&amp;o=date" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/search/3799983/?q=zinc+blister&amp;o=date">https://www.cointalk.com/search/3799983/?q=zinc+blister&amp;o=date</a>[/QUOTE]</p><p><br /></p>

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