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<p>[QUOTE=&quot;borgovan, post: 580327, member: 13016&quot;]I&#039;ve seen this happen on 1961 proof sets before. Strangely enough, it does seem most prominent when the inner seals have been broken, and the coins are loose. Perhaps there was a slightly different composition to the plastic envelope that cause it to become brittle with time, but also caused toning of the coins. I&#039;ll bet I&#039;ve seen half a dozen 1961 sets just like this. They&#039;re nice![/QUOTE]</p><p><br /></p>

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