cranston is a little misleading because a vast majority of them (i suspect) are not graded and likely never will be. Demmitt and O'Hara are well known as polarbear-only rarities so a large % of known copies will be graded. not all of course, but many more than cranston's percentages.
another thing to consider is that within polar bear backs they are not any rarer than any other polar bear subject.....its just that all other polar bear subjects are available in common piedmont/sweet cap backs (and likely several other backs).
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