I have a theory that high grade PSA pre-war cards, including primarily caramels, are becoming more readily available only if they did not cross into SGC holders. So, not only may you not see many of them -- because they have been squirreled away into private collections (that's what was happening when the prices were rising earlier this decade) -- but the ones you do see available at auction or in sales are likely to be the over-graded ones.
I recently began dabbling in high grade E92 Dockmans. I have to say, the number of overgraded PSAs in this class has been stunning. And there are basically no high grade SGCs available. I think that's because the current wave of E92 collectors have finished their sets for the most part, and are only leaking back into the market the overgraded ones, which tend to be PSAs.
That's my two cents.
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