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1880nonsportsdescriptively but my hierarchy/ranking a bit different:
SGC - 9. More likely to get an undergraded card.
PSA - 6. More likely to get an overgraded card.
GAI - 2. Can't be trusted at this point.
BVG - 1. There has to be a reason for the card not sitting in a real holder. My one and only experience - I own one N29 in BVG and it looks pretty good to me. I never saw the card out of the holder however).
CSA/ASA/PRO and a host of others - (-9)
You are REALLY taking chances with the others
my biggest problem with SGC is that I think their grades are a bit harsh when it comes to differentiating what deserves to be lowered and to what degree... example might be a card with all the atributes of a nearmint card in the N28 series given a 30 for a head-of-a-pin sized spot of loss on a blank portion of the reverse - or some of my N43's in clearly exmt condition (or better!) save a lightly penciled "7" on the back graded "40". I erased the mark on the back of one with an eracer and with a special powder on the other. One got a "40" and the other a "30". Still feel they are the most diligent.......
(edited for clarity)