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<p>[QUOTE=&quot;dd27, post: 2621261, member: 80416&quot;]I did not know that professional graders must grade so many coins in a day. That fact alone made David&#039;s post valuable, although he offered several astute observations IMHO.</p><p><br /></p><p><br /></p><p><br /></p><p>I&#039;m not a certified expert coin collector, but I knew exactly what David was talking about in that paragraph that begins with &quot;Bag marks are OK for some coins, not so for others.&quot;</p><p><br /></p><p>I omitted #2 (above) because it was not related to the grading variability issue, and because it&#039;s a great question: &quot;Where did you learn how many coins are graded each day?&quot; Perhaps Charles Morgan mentioned it in the <i>CoinWeek</i> video?</p><p><br /></p><p>With regard to TPG&#039;s grading accuracy, I contend that we do not know how accurate they are, or if PCGS is really more accurate than NGC (which a lot of folks seem to believe) or if PCGS and NGC are more accurate than ANACS (another widely held belief). </p><p><br /></p><p>Until someone conducts a scientifically sound study of TPG grading accuracy, the best we&#039;ll have is educated guesses. Such accuracy estimations, e.g., the opinion surveys about TPGs, have value but they do not answer the accuracy question with nearly as much reliability as a formal research project. </p><p><br /></p><p>~ Mark[/QUOTE]</p><p><br /></p>

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