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MVSNYCJimB- i actually thought what PSA "changed" regarding their bump system, was that cards that were newly graded or bumped (basically all new flips), have the digit (6,7,8, etc) below the text (NM-MT, etc)...people complained that you cannot tell if a card had been reviewed (unless it was bumped, then obviously it had a 1/2 grade attached to it) or not becasue the new flip looked like the old flip...so they created that as a way to differenciate between old slabs and fresh ones.
the way i understand it, is that they review a card thru the slab, if it meets the standards for a bump, it will get cracked & re-holdered (new flip). if it doesn't meet the standards for a bump, it is left in the current slab (same flip).
can anyone else confirm this?