I think the only way we will know what backs the t206 unknowns are, would be if PSA offered a free grading of a T206 card with every T206 unknown submitted. I believe with the right advertising from them while running the special for a whole year, i would say whatever is left in the unknown after that is probably cards that were broken out or crossed over. They really need to overhaul all t206's and list the subject and factory numbers too. Lets not forget the t205's either.
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