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<p>[QUOTE=&quot;physics-fan3.14, post: 2607104, member: 19165&quot;]It is usually due to contaminants in the environment. It could be from contact with whatever it was stored in, or oils left from someone&#039;s hand when they touched it (the coin appears to have been handled quite a bit over its life, and probably grades a high AU). I sometimes call them &quot;sneeze marks&quot; - imagine someone sneezing in the vicinity of a coin, and all the little droplets land on a coin and start corroding it (not necessarily saying that&#039;s what happened with this one, but it sorta looks like that). Sometimes it can be removed, sometimes it can&#039;t.[/QUOTE]</p><p><br /></p>

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