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MarkB and E - I crossed over 4 SCD cards to GAI recently. Two of them received the same grade and two of them were actually bumped up. Mike Baker told me SCD tended to grade conservatively because it was the "new kid on the block." I actually considered buying SCD cards on purpose and crossing them over, since they do not sell for as much as those of the Big 3, but I am too lazy to do so.