Here is the Rarity Scale from Walter Breen's Complete Encyclopedia of U.S. and Colonial Coins. (One of the best reference books ever created for coin collectors) I know, I know, coins, but the definition should be the same.
Unique = 1
Nearly Unique = 2-3
Extremely Rare = 4-12
Very Rare = 13-30
Rare = 31-75
Very Scarce = 76-200
Scarce = 201-500
Uncommon = 501-1250
Common = 1251-and up
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