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<p>[QUOTE=&quot;lordmarcovan, post: 8081930, member: 10461&quot;]I&#039;m not sure, but it might be &quot;end roll&quot; toning.&nbsp; That circular stain might have resulted from part of the end of the roll the coin was in being open, thus partially exposing that area and causing it to tone.</p><p><br /></p><p>But if it&#039;s an end roll toner, it&#039;s rather unusual- I&#039;ve never seen one with that pattern.</p><p><br /></p><p>On the other hand, it could also just be a mystery stain of unknown origin.[/QUOTE]</p><p><br /></p>

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