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<p>[QUOTE=&quot;physics-fan3.14, post: 2490397, member: 19165&quot;]I, as the second of the Summoned creatures, will agree that it appears to be struck through grease on the reverse. This is incredibly common, and adds no premium. </p><p><br /></p><p>Far more interesting to me, and so far unmentioned by the other Summon, is the apparent crack at the edge. A clamshell is a type of lamination error where the coin is essentially split at the edge. The early years of clad coinage are known for many of these types of problems - the mint hadn&#039;t quite figured out how to make clad coinage yet. For more info on these, you can read the article here: <a href="http://www.coinworld.com/news/us-coins/2013/01/clamshell-splits-clamshell-separations-are-un.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coinworld.com/news/us-coins/2013/01/clamshell-splits-clamshell-separations-are-un.html" rel="nofollow">http://www.coinworld.com/news/us-coins/2013/01/clamshell-splits-clamshell-separations-are-un.html</a></p><p><br /></p><p>Can you take pictures which are a bit more in focus, and perhaps better lit? It does appear that this may be the beginning of a clamshell error. The minor cracking on yours means that it won&#039;t really get much of a premium (a few dollars, if confirmed as a clamshell). But it is really cool, and is one of the less common errors.[/QUOTE]</p><p><br /></p>

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