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Frank Cjim - unfortunately the PSA population report does not differentiate between different series of the same back. In fact for many cards backs are not listed at all.
barry - I understand this just a sample of the overall T206 population, but I would argue that it would be a relatively unbiased sample, as opposed to the distribution of fronts (subjects), where you'll find many more Cobbs than Hinchmans. Unlike fronts, the back pricing is purely a function of scarcity. I'd be interested to see as large a sample as we could get - to see how well the numbers correlate with the perception.