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<p>[QUOTE=&quot;Insider, post: 2600610, member: 24314&quot;]Error coins seem to be prone to these marks due to the often irregularity of the error&#039;s shape.</p><p><br /></p><p>&quot;Wheel marks&quot; are generally due to the counting wheels but they can be made when any rotating wheel comes into contact with the coin&#039;s surface.&nbsp; Much of the time (easiest to detect) they leave a bright PL patch on the coin that is especially visible when the coin is held in certain orientations to the light (mentioned above). </p><p><br /></p><p>The most deceptive wheel marks are usually found on frosty Unc Washington quarters, dimes, and Half dollars.&nbsp; On these, the patch is more like a series of parallel hairlines that blend in with the surface.&nbsp; Although often caused by a &quot;wheel&quot; of some sort they don&#039;t meet the criteria.&nbsp; When they are present, coins that look like gems are just downgraded as most collectors cannot detect them at all and the coins look nice.[/QUOTE]</p><p><br /></p>

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