Silver Bullion - The Universal Rarity
Scale
The Universal rarity scale (URS) is the brainchild of Q. David
Bowers. He developed it in 1992.
Universal Rarity Scale (URS)
|
Rarity
|
Number of known
coins
|
|
URS 0
|
None known
|
|
URS 1
|
1, unique
|
|
URS 2
|
2
|
|
URS 3
|
3 or 4
|
|
URS 4
|
5 to 8
|
|
URS 5
|
9 to 16
|
|
URS 6
|
17 to 32
|
|
URS 7
|
33 to 64
|
|
URS 8
|
65 to 125
|
|
URS 9
|
126 to 250
|
|
URS 10
|
251 to 500
|
|
URS 11
|
501 to 1,000
|
|
URS 12
|
1,001 to 2,000
|
|
URS 13
|
2,001 to 4,000
|
|
URS 14
|
4,001 to 8,000
|
|
URS 15
|
8,001 to 16,000
|
|
URS 16
|
16,001 to 32,000
|
|
URS 17
|
32,001 to 65,000
|
|
URS 18
|
65,001 to 125,000
|
|
URS 19
|
125,001 to 250,000
|
|
URS 20
|
250,001 to 500,000
|
Source: Wikipedia
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