It is both a rarity scale and a scoring scale. It does not take into account the condition ,the medium, or the type of writing implement, only the basic fact of the autograph alone... nothing else matters.
The Campanella is for a pre accident signature I have been told.
The scale in my opinion is way off on the rarity side.
I long suspected that it is somewhat based on their opinion based indirectly how many they have graded , as well as their perceived idea of a number of autographs out there.
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