Kevin,
I know of a slightly different scale that is used for large cent varieties so the coin hobby may have more than one:
R8+: unique
R8 : 2 known
R8- : 3
R7+ : 4-6
R7 : 7-9
R7-: 10-12
R6+: 13-18
R6 : 19-25
R6-: 26-30
R5+: 31-45
R5 : 46-60...
And it continues on to R1, which is 1500 or more known of the variety. Maybe different areas of the coin hobby have their own scale.
Last edited by barrysloate; 06-01-2012 at 12:28 PM.
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