Introduction:
Universal Rarity Scale
Universal Rarity Scale
CONECA has officially adopted the Universal Rarity Scale (URS), devised by Q. David Bowers, as the means by which we will show degree of rarity for any given variety (see table below). Through the years, many methods have been used to identify relative rarity, but this one has taken the hobby by storm in recent years. It is by far the most defined and adaptable system currently known. By acting as a variety clearinghouse, CONECA will be able to assign URS values with a great degree of accuracy. A word of caution is necessary. We fully expect the URS figures given in our attribution guides to change, sometimes dramatically, as interest in varieties increase.
| URS | Quantity | URS | Quantity |
| URS-0 | None known | URS-12 | 1,001 to 2,000 known |
| URS-1 | 1 known, unique | URS-13 | 2,001 to 4,000 known |
| URS-2 | 2 known | URS-14 | 4,001 to 8,000 known |
| URS-3 | 3 to 4 known | URS-15 | 8,001 to 16,000 known |
| URS-4 | 5 to 8 known | URS-16 | 16,001 to 32,000 known |
| URS-5 | 9 to 16 known | URS-17 | 32,001 to 64,000 known |
| URS-6 | 17 to 32 known | URS-18 | 64,001 to 125,000 known |
| URS-7 | 33 to 64 known | URS-19 | 125,001 to 250,000 known |
| URS-8 | 65 to 125 known | URS-20 | 250,001 to 500,000 known |
| URS-9 | 126 to 250 known | URS-21 | 500,001 to 1,000,000 known |
| URS-10 | 251 to 500 known | URS-22 | 1,000,001 to 2,000,000 known |
| URS-11 | 501 to 1,000 known | URS-23 | 2,000,001 to 4,000,000 known |
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Copyright James Wiles, 2011
Email: jameswiles@sbcglobal.net
1490 Trail View Lane
Frisco, TX 75034-2649