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<p>[QUOTE=&quot;Conder101, post: 2484562, member: 66&quot;]I don&#039;t find the URS useful at all or at least it has no advantage over the Sheldon scale.</p><p><br /></p><p>Only the first 12 levels of the URS have any real meaning.&nbsp; Once you get beyond URS 12 the number of survivors is large enough that the rarity level just becomes a wild ass guess.&nbsp; &quot;Is it a URS 14 or 15?&quot;&nbsp; No one has ANY way of knowing if the number of surviving specimens is between 4,000 and 8,000 or 8,000 and 16,000.&nbsp; (A TPG pop report might be a little helpful, but it only tells you how many they have graded, not how many they have seen but not graded, or how many are out there in all grades that have never been sent in.)&nbsp; So you can&#039;t meaningfully assign a URS number to it at that level.&nbsp; (Even in the Sheldon scale we only speak of the number &quot;known&quot; for R-5 or higher.&nbsp; R-4 or lower are terms as &quot;estimated&quot; so even the Sheldon scale recognizes that once you get beyond 75 pieces you are estimating or guessing the number of survivors.)&nbsp; Then if you look at the top of the URS scale it uses three numbers that are roughly the same as Sheldon&#039;s R-8 and Sheldon can cover those with 8+, 8, and 8-&nbsp; So that leaves Sheldon with 8 levels and the URS with 9 usable levels.&nbsp; The URS 4 and 5 equate to Sheldon R-7.&nbsp; After that there isn&#039;t a lot of difference.&nbsp; The levels break at slightly different points but that is no great improvement.&nbsp; So really there is no advantage in using the URS scale over that of the Sheldon scale.&nbsp; If it is a Sheldon R1+ it is very common, and if it is larger than a URS-12 it is still very common.[/QUOTE]</p><p><br /></p>

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