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Message:: [QUOTE="19Lyds, post: 1786324, member: 15929"]OK. All nice answers but here's the real reason folks. PCGS Populations are based upon "coin numbers" not certification numbers. (BTW, certification numbers are assigned in the receiving department and EVERY coin receives a certification number.) For example [ATTACH=full]287145[/ATTACH] On the coin above, the numbers to the left of the "/" are the coin number and assigned grade. (i.e. NNNN.GG) The numbers to the right of the "/" are the certification number (i.e. CCCCCCCC)  NNNN.GG/CCCCCCCC Without reading the text of the label, the coin is a 1974-D Eisenhower Dollar which is graded MS66. Now, if the coin number.grade does not match the text of the label, then you're looking at a possible counterfeit. On the coin below, the numbers are ENNNN.GG followed by the Certification number.  [ATTACH=full]287144[/ATTACH] Both coins are 1974-D Eisenhower Dollars but only the top coin can be used in the registry. As for populations, I do not know if "error coins" are used in the population reports. I expect not since the coin numbers are numeric but error coin numbers are alphanumeric. It is very important to understand that PCGS does EVERYTHING, based upon the coin number which is heart of PCGS's inventory system (i.e. populations). NGC, on the other hand, assigns a certification number for a coin based upon the submission number. Now, it should be as clear as mud.[/QUOTE]