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<p>[QUOTE=&quot;BadThad, post: 710980, member: 17261&quot;]Yes, this is a Zincoln.</p><p>&nbsp;</p><p>The browning of copper is mostly due to exposure to organic substances such as skin oil. I believe this coin saw heavy circulation in it&#039;s short life. It also was exposed to high humidity at some point which prompted the verdigris formation.</p><p>&nbsp;</p><p>I would be very, very suprized if this coin sat submerged in water. Water, even though corrosive, would actually provide a bit of protection from organic browning substances. I suspect the effect of water would be some pitting and loss of plating, definately not browning.[/QUOTE]</p><p><br /></p>

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