Be very careful crossing over CSG cards for vintage. From looking on eBay, the majority of the cards for vintage are over graded. With the old labels, getting a CSG 9.5 Gem Mint was much harder than PSA, but this does not mean they grade harder for all grades. Once CSG grades get under 8.5, PSA/SGC grades much tougher IMO. For lower grades it almost seems they use a BVG scale, which makes sense since the lead graders came from Beckett and were lead graders for BVG.
Early CSG vintage cards were an absolute mess. I saw CSG 7's with ink marks on the back. I saw CSG 5's which had creases. It seems like they tightened things up as they went along, but I would not trust the slabs unless you can see the cards in person.
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