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<p>[QUOTE=&quot;SuperDave, post: 2297683, member: 1892&quot;]It&#039;s conceivable that the apparent residue visible at bottom right on both faces could be the evidence of cleaning. It&#039;s conceivable that it <b>is</b> evidence of cleaning. One set of images is prejudicial by nature. There is no &quot;dispute&quot; with NGC, really; you paid for a <i>subjective</i> opinion and they&#039;ve cost you no value.</p><p><br /></p><p>I don&#039;t have any experience playing with GSA slabs. Unless they were physically sealed via ultrasonic welding or heat, if they could be closed they could be opened.[/QUOTE]</p><p><br /></p>

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