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grilloj39I have had good success in crossing over PGS 7 and 8 vintage commons over to PSA and GAI 7s and 8s. I feel they have built a decent reputation on the mid-grade star to semi-high grade common vintage card market.
I do not know however, if they have the expertise in detecting those fake, altered, or trimmed cards of high grade material. I haven't seen a high-end vintage PGS card for quite a while now.