Bumping this thread with a few extra details that I noticed. The reverse of style 8 is different than the reverse of style 7. In particular, the PSA logo and the text about being a division of collector's universe are holograms on style 8 flips, whereas on style 7 they were just silver.
There also might have been a change to the slab itself - although I don't have enough graded cards to know for sure. All of my style 8 and 9 cards have a deep lip around the edge of the reverse of the slab. I have two cards in slabs with older flips (styles 3 and 7) and they both have a much shallower lip around the edge on the reverse.
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