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Josh K.I have had many gai graded cards cross over into the same/equivalent sgc slab. Ive even had a few tweeners cross up from gai to sgc (for example, a 2.5 to a 3) - however, those are also the grades where you are most likely to have a down grade (the half grades that sgc does not have an equivalent for - ie 2.5, 3.5, 4.5).