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CatMy post may not pertain to this book, but I have searched around the site and cant't find an answer to a t206 question. Anything that is not Sweet Cap or Piedmont is rare according to the SMR, but Old Mills, Polar Bears and El Principe's seem to appear far more often than the Cycle or Drum backs as an example. Is there any written or website detail as to the actual rarity of the various t206 backs? No where have I seen PSA or SGC list volume of the graded backs. Is there data available in any publication or website as to percentage breakdown to the backs?