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<p>[QUOTE=&quot;beef1020, post: 1681966, member: 24544&quot;]In Sheldon&#039;s book on large cents he separates out collectable varieties from non-collectable variates as those with 3 or more available to collectors vs those with &lt;3 available.&nbsp; So for instance if there are 4 known of a variety to exist but 2 are in museums than the variety was a non-collectable.</p><p><br /></p><p>I think it was one of the largest mistakes he made in the book as it makes emission sequences very unintuitive.&nbsp; For the collectable varieties he listed them as S-1, S-2, S-3,&nbsp; ... S-295 in sequential order.&nbsp; But the non-collectable varieties start at NC-1 for each year.&nbsp; </p><p><br /></p><p>Additionally, as time passed, most of the NC varieties now have more than 3 available to collectors and are not truly non-collectable varieties, but because the Sheldon numbers are sequential from 1793 to 1814 there is no way to give the now collectable NC varieties an S- number.&nbsp; &nbsp; Right, you can&#039;t make the 1797 NC-5 now S-296 just because it&#039;s collectable because it messes up the whole numbering sequence.&nbsp; The middle late dates don&#039;t have this issue as the Newcomb number starts over each year at N-1...&nbsp; A new variety is found and it&#039;s generally added as the next available N number.</p><p><br /></p><p>So what exactly is a Sheldon set of large cents, does it include NCs or is it just S-1 through s-295?&nbsp; This problem also makes NCs generally less valuable than equally rare S- numbered varieties, as a lot of collectors do not include the NCs in their variety sets.[/QUOTE]</p><p><br /></p>

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