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Message:: [QUOTE="CappedBustDimes, post: 561308, member: 9104"]Sheldon scale.R8 = 1-3 known (estimated), "Unique or Nearly Unique"R7 = 4-12 known, "Extremely Rare"R6 = 13-30 known, "Very Rare"R5 = 31-75 known, "Rare"R4 = 76-200 known, "Very Scarce"R3 = 201-500 known, "Scarce"R2 = 501-1250 known, "Uncommon"R1 = over 1251 known, "Common" Overton's Scale.R8 1-3 Known Nearly UniqueR7 4-12 Rare, with only a few specimens existingR6 13-30 Extremely Scarce, infrequent appearances at large shows or major auctionsR5 31-75 Very Scarce, a few examples will appear at large shows or auctions across a yearR4 76-200 Scarce, may or may not be available at larger showsR3 201-500 Tough Date, limited number of examples at a large showR2 500-1250 Better Date, generally available at most shows but in limited quantitiesR1 1250+ Common QDB also created a scale called the universal rarity scale.. URS-0 None knownURS-1 1 known, uniqueURS-2 2 knownURS-3 3 or 4 knownURS-4 5 to 8 knownURS-5 9 to 16 knownURS-6 17 to 32 knownURS-7 33 to 64 knownURS-8 65 to 125 knownURS-9 126 to 250 knownURS-10 251 to 500 knownURS-11 501 to 1,000 knownURS-12 1,001 to 2,000 knownURS-13 2,001 to 4,000 knownURS-14 4,001 to 8,000 knownURS-15 8,001 to 16,000 knownURS-16 16,001 to 32,000 knownURS-17 32,001 to 65,000 knownURS-18 65,001 to 125,000 knownURS-19 125,001 to 250,000 knownURS-20 250,001 to 500,000 known[/QUOTE]