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<p>[QUOTE=&quot;swhuck, post: 969427, member: 21044&quot;]That&#039;s kind of how it works, but it&#039;s not precise.</p><p>&nbsp;</p><p>You are right in that the base numbers never change; once a coin has a number, it stays there. However, when the numbers were first assigned, they only went up to 10000, and they ran out of room a long time ago.</p><p>&nbsp;</p><p>The numbers were first assigned essentially by looking at Red Book varieties; for the most part, when a coin had a variety listed in the Red Book when the numbering system started, it received its own four digit number. </p><p>&nbsp;</p><p>Certain designations, presumably the ones that were being assigned at the time, also received four digit numbers. For instance, the following all have separate numbers: All copper coins in Red, Red/Brown and Brown; Mercury dimes with full bands; Prooflike Morgan dollars; Full Head Standing Liberty quarters (I think that&#039;s all). Proof coins also had completely different four digit numbers than their circulation strike counterparts.</p><p>&nbsp;</p><p>A certain amount of room was left over for new varieties, as well; there are generally several unassigned four digit numbers at the end of each, and in some cases, varieties have already been assigned to the end of the series. For example, these PCGS numbers correspond to the following Morgan dollars:</p><ul> <li>7292: 1904-O (7293 is the same coin prooflike; the pattern extends throughout the series)</li> <li>7294: 1904-S</li> <li>7296: 1921 Morgan</li> <li>7298: 1921-D</li> <li>7300: 1921-S</li> <li>7302: 1901 Doubled Die</li> <li>7304: 1902-O Micro O (!)</li> <li>7306: 1903-S MIcro S</li> <li>7308: 1888-O Doubled Die</li> <li>7310: (Generic Proof Morgan; they ran out of room for new varieties here)</li> </ul><p>As more designations were added, new numbers were assigned. There was no more room for four digit numbers, so in general the new numbers were assigned by prepending an 8 or 9 to the basic four digit number. This is how PCGS numbers were assigned to Full Step Jeffersons, Full Torch Roosevelts, Deep Mirror Prooflike Morgans, and Cameo and Deep Cameo proofs. For instance, a 1882-CC dollar has the number 7134 for a normal coin, 7135 if it&#039;s prooflike, and 97135 if it&#039;s Deep Mirror Prooflike.</p><p>&nbsp;</p><p>PCGS numbers for colonials and Territorial/Fractional gold generally follow the same rules except that Colonials generally have numbers less than 1000, and the others have numbers of 1xxxx. </p><p>&nbsp;</p><p>Patterns have numbers in the form 1xxxx, 6xxxx, and 7xxxx. The last four digits are generally in order of the Judd number, but I don&#039;t think there&#039;s a whole lot of rhyme or reason to the first digit.</p><p>&nbsp;</p><p>Inevitably, newer coins have caused the original PCGS numbering system to run out of room in places. For most, if not all, coins of the 21st century, the numbering system tends to be based on wherever they could find room. In addition, as entire series are cataloged by variety (most notably Bust Halves), new numbers are found for them as well.</p><p>&nbsp;</p><p>And this doesn&#039;t even cover world coins. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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