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JimBYou can't go too wrong with PSA on T206s. I think popularity of grading companies depends on the set and the grade of the card. Blanket statements about vintage cards in SGC and 50's and 60's in PSA are simplistic and inaccurate in my opinion. That said, I think a lot of mid to low grade T206 collectors (at least the vocal ones on this board - and it is not at all clear they are representative of the buying public as whole who are interested in these types of cards) prefer SGC.
JimB