I absolutely love oddball Mantle cards and this is by far the oddest thing I have ever seen. It was described to me as a 1958 issue by National Sports Council. It is 11X14 and is printed on card stock. The bizarre part is the back. Mantle discusses at length the benefits of living in America rather than communist Russia, and it contains pictures of Stalin and other dictators.
Many thanks to Chris (pawpaw) for letting me know this even exists and for sending me a link to it. I owe you!