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Message:: [QUOTE="borgovan, post: 804838, member: 13016"]I should clarify. I actually believe the R-1 is the Sheldon Rarity Scale: R‑1 Common R‑2 Not So Common R‑3 Scarce R‑4 Very Scarce (population est. at 76‑200) R‑5 Rare (31‑75) R‑6 Very Rare (13‑30) R‑7 Extremely rare (4‑12) R‑8 Unique or Nearly So (1, 2 or 3)  The Universal Rarity Scale is another animal: URS‑0 None known URS‑1 1 known, unique URS‑2 2 known URS‑3 3 or 4 known URS‑4 5 to 8 known URS‑5 9 to 16 known URS‑6 17 to 32 known URS‑7 33 to 64 known URS‑8 65 to 125 known URS‑9 126 to 250 known URS‑10 251 to 500 known URS‑11 501 to 1,000 known URS‑12 1,001 to 2,000 known URS‑13 2,001 to 4,000 known URS‑14 4,001 to 8,000 known URS‑15 8,001 to 16,000 known URS‑16 16,001 to 32,000 known URS‑17 32,001 to 65,000 known URS‑18 65,001 to 125,000 known URS‑19 125,001 to 250,000 known URS‑20 250,001 to 500,000 known  Sorry to confuse with my earlier post[/QUOTE]