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<p>[QUOTE=&quot;Insider, post: 5032854, member: 24314&quot;]Back in to old days...</p><p><br /></p><p>Technical Grading used at two authentication services ONLY IN DC evolved to describe a coin as accurately and precise as humanly possible.&nbsp; Coins were graded using florescent light and a stereo microscope set at low power.&nbsp; We could see ALL the defects (including hairlines) and rub on the coin despite an incandescent light was not used.&nbsp; All the attributes used to grade a coin were divided into smaller categories.&nbsp; The aim of technical grading was to be able to identify a coin and describe it as best we could to someone who could not see it. </p><p><br /></p><p>The &quot;strike&quot; leg of the &quot;technical&quot; grading stool was broken down into:</p><p><br /></p><p>Strong</p><p>Normal</p><p>Weak</p><p>Flat[/QUOTE]</p><p><br /></p>

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