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Posted By: MW

MVSNYC,

Assuming your figures are correct for a PSA 6 Uzit Cobb, I can't think of any T206s (and not very many other vintage cards) for which a PSA 8 is only worth double the price of a PSA 6. The multiplier (from a PSA 6 to a PSA 8) is much larger than that for both commons and Hall of Famers.