I wonder if the "cards" printed in Sports Illustrated were supposed to be cut out. I suppose so, considering the backs were printed on the other side of the page.
As far as value, William Wilen's Mickey Mantle Baseball Card Collector's Guide (Summer Game Books, 2016) says the Mantle card from the fold-out, by itself, books at $225. Unfortunately, Wilen incorrectly states that the fold-out "included nine players, including Mantle, as they had appeared in their 1954 Topps card" (page 32) when the reality is that Mantle did not have a 1954 Topps card.
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