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<p>[QUOTE=&quot;Oldhoopster, post: 2921553, member: 84179&quot;]It&#039;s not hard to imagine that the residue on the coin could have come from someplace between the minting process and rolling the coins.&nbsp; It would have been interesting to note if the coin next to it in the roll that was in contact with the residue had any marks or corrosion, but it sounds like that information is gone.</p><p><br /></p><p>But if it is corrosion, and it was strong enough to remove some of the date, why wasn&#039;t the copper plating breached?&nbsp; It&#039;s pretty thin and once zinc is exposed to anything reactive, it seems to corrode like crazy</p><p><br /></p><p>When you find the coin and check for the filled/struck through characteristics let us know.&nbsp; I&#039;m leaning towards corrosion but.... </p><p><br /></p><p>And, there has been some discussion on CT regarding the term &quot;Grease filled die error&quot;.&nbsp; You may actually have a true &quot;Grease filled die error&quot;. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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