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<p>[QUOTE=&quot;SuperDave, post: 2334976, member: 1892&quot;]&quot;NT&quot; doesn&#039;t necessarily mean one single exposure to appropriate &quot;NT&quot; conditions; it could well have begun, stopped with a sale into a location with cleaner air, and then restarted with a move into more sulphur-laden air.</p><p><br /></p><p>Maybe the owner had a beautiful crescent-toned coin, and then a volcano erupted upwind and temporarily increased local sulfur content. I suspect the recent Icelandic eruptions blowing over Europe created a bunch of this.[/QUOTE]</p><p><br /></p>

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