Fuld rarity scale
· R-1: Greater than 5,000
· R-2: Between 2,000 and 5,000
· R-3: Between 500 and 2,000
· R-4: Between 200 and 500
· R-5: Between 76 and 200
· R-6: Between 21 and 75
· R-7: Between 11 and 20
· R-8: Between 5 and 10
· R-9: Between 2 and 4
· R-10: Unique (one known example)