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<p>[QUOTE=&quot;BadThad, post: 528558, member: 17261&quot;]I definately don&#039;t attribute this to cleaning. In hand this coin is full of luster and it cartwheels. Perhaps I&#039;m naive, but every cleaning process I&#039;ve seen removes the luster and the coin no longer cartwheels. Also, if the coin was dipped, it would affect the surface evenly unless there were variations in the planchet mix. I&#039;ve seen this same thing on other BU Lincolns, as I&#039;m sure other experienced collectors have as well.</p><p>&nbsp;</p><p>rlm - I have to respectfully disagree on the mix problem always going through to both sides. I don&#039;t have a picture, but I have a 50&#039;s cent that clearly has a high zinc concentration on parts of the obverse only (silvery appearance), the reverse is normal.</p><p>&nbsp;</p><p>When the alloy is uneven the surfaces will oxidize and tone at different rates. I agree there was an external environmental influence, but I would expect that to evenly affect the surface if the planchet was homogeniously mixed.[/QUOTE]</p><p><br /></p>

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