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<p>[QUOTE=&quot;Lucky Cuss, post: 1865361, member: 44086&quot;]If I remember correctly, the Sheldon scale arose from his observtion that the poorest condition penny, albeit still identifiable, was worth 1/70th that of a &quot;perfect&quot; one.&nbsp; Of course, that ratio hardly holds true for every denomintion and issue, but we still have that 1 to 70 score in use for all coinage, and I suppose it works well enough.&nbsp; It&#039;s certainly entrenched.</p><p>&nbsp;</p><p>One problem with any universal rarity scale is that it&#039;s hard to take into account the impact of <i>where</i> you&#039;re collecting on that factor.&nbsp; Also, at the high end, many uncommon coins in the highest grade are locked up in collections, which renders their effective rarity much higher.&nbsp; That&#039;s just one aspect of the whole issue of <i>condition</i> rarity, which can get complicated.[/QUOTE]</p><p><br /></p>

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