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Posted By: JimB

I would probably cross it over just for the aesthetics of having the whole set in similar holders. I don't the value of the set would change much either way if it was in all PSA 4s or all SGC 50's if a set like that were sold as a complete set. For that matter, if you left it, it probably would not affect it either, though some people, like me, perfer uniformity in slabs for a set.
JimB