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Marc S.Again -- it was done in the 1960s and 1970s -- and if you notice, none of the cards are truly in "great" shape. It was before the baseball card market was truly something to reckon with, and it made sense from the producer's standpoint to put the stars in front -- it's not much different than someone today running an Ebay auction "1989 Topps -- 100 card lot, Ryan and Schmidt included".
A way to market off-condition/factory leftovers from years past to a careless market.