I do subscribe to the thought that there is or will be some increased value assigned to rarer semi-common backs in the future. I believe Ted Z. addressed this rarity in one of his recent posts discussing the relative rarity of several Old Mill poses, known populations of the Old Mills in many cases is very very low. Additionally, the population of these cards could even be lower as the cards could have been submitted on more than one occasion though that could be offset by the fact that backs weren't specified in the earlier population reports. In any case, I think it's interesting to look at those reports and try to accumulate those rarer semi-common backs that have few specimens known, ie Chesbro Sovereign only 1 listed between both PSA and SGC. Would think these type of cards will increase in value especially in a case like Chesbro where both population is low and he is a hall of fame player.
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