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<p>[QUOTE=&quot;Neal, post: 26593922, member: 43872&quot;]Not a chemist, but I suspect it is toning of some kind, and whether it showed that badly or not when originally graded, many graders would not let toning alone lower a grade.&nbsp; Many people seek out unusual or &quot;pretty&quot; toning, and would consider it a bonus.&nbsp; Personally, I consider all toning a kind of environmental damage, since something in the environment had to chemically react with the metal on the coin&#039;s surface.&nbsp; As is often said of damaged coins, &quot;It didn&#039;t come from the mint that way.&quot;&nbsp; That spot could be where someone, perhaps a Treasurer of the United States or other official, held the coin at one time and had something unusual on his thumb.&nbsp; Perhaps at some point someone pushed it into a coin holder or album slot.[/QUOTE]</p><p><br /></p>

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