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<p>[QUOTE=&quot;physics-fan3.14, post: 3254424, member: 19165&quot;]Here is a link to the most recent press release, which you mentioned, from PCGS concerning PL/DMPL: <a href="https://www.pcgs.com/news/pcgs-adds-pl-and-dmpl-designations" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.pcgs.com/news/pcgs-adds-pl-and-dmpl-designations" rel="nofollow">https://www.pcgs.com/news/pcgs-adds-pl-and-dmpl-designations</a></p><p><br /></p><p>Searching back, I see nowhere that PCGS ever states 8 inches as the minimum.</p><p><br /></p><p>In fact, if you read their published grading guide (from 2004), you&#039;ll see exactly the same 2-4 inches for PL, 6 inches for DPL. (For those reading along at home, this is on page 75): <a href="https://smile.amazon.com/Official-Guide-Grading-Counterfeit-Detection/dp/0375720502/ref=smi_www_rco2_go_smi_g5171374337?_encoding=UTF8&amp;%2AVersion%2A=1&amp;%2Aentries%2A=0&amp;ie=UTF8" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://smile.amazon.com/Official-Guide-Grading-Counterfeit-Detection/dp/0375720502/ref=smi_www_rco2_go_smi_g5171374337?_encoding=UTF8&amp;%2AVersion%2A=1&amp;%2Aentries%2A=0&amp;ie=UTF8" rel="nofollow">https://smile.amazon.com/Official-Guide-Grading-Counterfeit-Detection/dp/0375720502/ref=smi_www_rco2_go_smi_g5171374337?_encoding=UTF8&amp;*Version*=1&amp;*entries*=0&amp;ie=UTF8</a></p><p><br /></p><p>I don&#039;t have the first edition from 1997, if someone who has it could check and verify that it&#039;s the same? There may have been some stricter requirements in the very early days, but all the published information I can find says the same 6 inches. Other authors who have written about DMPL Morgans have advocated for tighter standards, but none were officially implemented.</p><p><br /></p><p>How strictly PCGS interprets the standards may have changed over time, but the published standard has always been the same from what I can find.</p><p><br /></p><p><br /></p><p><br /></p><p>NGC has not published the distances they use. I&#039;ve asked them, and they have told me they won&#039;t share that information. The most detailed explanation you&#039;ll get from NGC is here: <a href="https://coinweek.com/education/coin-grading/learn-coin-grading-from-ngc-prooflike-and-deep-prooflike/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://coinweek.com/education/coin-grading/learn-coin-grading-from-ngc-prooflike-and-deep-prooflike/" rel="nofollow">https://coinweek.com/education/coin-grading/learn-coin-grading-from-ngc-prooflike-and-deep-prooflike/</a></p><p><br /></p><p><br /></p><p><br /></p><p>No, they don&#039;t. And they never did.</p><p><br /></p><p>Old ANACS, back when they used the small white holders had an UDM, with higher requirements (12 inches). But those are extremely rare to find.</p><p><br /></p><p><br /></p><p><br /></p><p>As for how they do it, they look at the reflection of their finger above the surface. None of them get out a ruler and measure it. Both PCGS and NGC use the same method.</p><p><br /></p><p>To see exactly how they do it, watch this clip of Scott Schecter from NGC actually grading a PL coin. Jump straight to 2:37 for the PL part, or watch the whole video (which is really informative):</p><p><br /></p><p>[MEDIA=youtube]QA7eN8ypSpw[/MEDIA][/QUOTE]</p><p><br /></p>

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