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Steve M.I recently cracked out 11 SGC AUTH graded T206 cards in an experiment and submitted them to PSA. Presuming all to be trimmed, at least according to SGC, I certainly would have a better than 10% "trim" rate. I am not a "card doctor". I did not trim the cards (nor any ever for that matter).
BTW, 6 of the 11 came back from PSA with numerical grades including 2 5's and a 6. 