Where I run into difficulties is trying to figure a fair value for some of the more obscure back variations, like SC 460/42 overprint or SC 150/649 overprint. T206 Museum suggests 1.3 and 1.4 multipliers, respectively, but there isn't a lot of recent data that I can readily find to see whether these are too large, too small or just right. There are just enough cards in holders that do not list these variations to make the PSA price database unreliable.
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