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<p>[QUOTE=&quot;ToughCOINS, post: 1925312, member: 20480&quot;]I would guess that &quot;mark&quot; is from stacking friction between coin and holder in a banded heavy stack of flipped coins.&nbsp; Shipments of flipped coins travel thousands of miles before grading and, while the majority of those miles are in the air, perhaps as many as a couple hundred of those miles introduce the stack of coins to road vibration, which could flatten the frost on the coins.</p><p>&nbsp;</p><p>Best conjecture I can come up with . . .[/QUOTE]</p><p><br /></p>

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