If you look at some of the 1952 Topps double prints (i.e., the Mantle), you'll notice minor differences between the cards. My understanding is that when Topps printed that series, each printing run (not sure how's my sheets it took for each series) would contain 2 Mantles on it and one of the single print cards. So, if the series was printed on one sheet, Mantle would appear in two locations on the sheet while others only once. Theoretically, there should be exactly twice as many of each double print made as a result.
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