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<p>[QUOTE=&quot;dbc99, post: 4772137, member: 101506&quot;]I&#039;m not an expert, but from my understanding, a straight grade is when a TPG actually assigns a number on the Sheldon scale (1-70) on the coin.</p><p>A &quot;crooked grade&quot;, as you call it is when they notice a cleaning or some other artificial flaws, but still think the coin is good enough to encapsulate, so they&#039;ll call it &quot;UNC Details - Cleaned&quot; or &quot;AU Details&quot;. This does drop the market value a good bit over a straight grade, but depending on condition can still pull in decent money.</p><p>If the cleaning is too harsh, or there&#039;s a graffiti or any other whoppers, they would simply refuse to slab it.</p><p><br /></p><p>Further complicating the matter is the concept of &quot;net grading&quot;, where if the cleaning was done really long ago and the toning of the coin has recovered to look more natural, they might internally net grade to call a AU details coin an XF40 or 45 on the slab, implying they think it&#039;ll sell for that money. There was a book I was reading which went in depth about how the TPGs generally do market grading rather than technical grading, and so rare issues might have an XF slabbed as an AU, and so on.[/QUOTE]</p><p><br /></p>

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