PSA probably doesn't do this with that set because it would anger collectors, but I have some cards they've graded that are labeled 1988-1992 on the flip because the exact same card was printed over several years.
I've also had a case where they were labeling once set for me with a certain year and then on another submission they labeled it with a different year. I complained because I want consistency in my collection and they corrected it to the year they'd given me previously. I don't know if it was actually an error on their part or if the set was made over two years.
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