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1967 Topps Pin-Ups Qestion

Im working on a PSA set of these. Im curious why alot of them are given a qualifier of MK. I also noticed on some of the scans on ebay that there is a sticker or label on the revers of the slab. Right in the middle of the flip and the pin up, can someone tell me what this is. I dont really like it as I think it takes away from the card/poster. Thanks in advance.
Looking for 1950 Bowman football PSA 7's

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