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<p>[QUOTE=&quot;Tom B, post: 1981092, member: 11854&quot;]The population reports are what they are, which at this time means they simply are another indicator of the number of times each issue has been sent into any TPG and how many grading events each has received.&nbsp; It&#039;s not perfect by any standard, but it is still information that can be worked with and interpreted.</p><p><br /></p><p>If your hypothetical PCGS MS64 is sent back to PCGS as a raw coin then it would indeed count again in the population report.&nbsp; If, however, it is sent back in its holder then the old holder data would be removed from the population report.&nbsp; Additionally, if used certification tags are sent back then they are removed from the database and population report, too.</p><p><br /></p><p>Guesstimating extant populations has been done to some degree on the PCGS CoinFacts website, but specialist groups have for many years done more detailed analyses regarding how many coins they believe have survived.&nbsp; These rarity ratings are supplied for many type coins from groups such as the Bust Half Nut Club.[/QUOTE]</p><p><br /></p>

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