Most difficult High Grade T206 PSA 5 or better
Hi,
I'm doing some casual research on PSA Graded T206 sets. What have been the most difficult high graded (for purposes of my analysis, high grade is considered to be PSA 5 or higher) cards to locate, irrespective of backs? I'm looking to get a sense of collectors' experience rather than simply looking at the population reports.
Thanks.
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