I don't have a definitive answer, but it looks as if it was cut off a periodical while Mickey was playing, involving along the lines of Sports Stars of ... , Baseball Stars of ... , Smith's Baseball Guide, etc.
Being blank-backed, many of those yearly, monthly, All-Star Game, or World Series themed mags would have a thick paper or thin cardboard cover. Long ago, somebody liked the picture of Mickey enough to cut out their own card to satisfy a desire for another Mantle "card".
I honestly cannot imagine it would have much value, but it's certainly a nice mid-career image of The Commerce Comet. Enjoy it as a souvenir.
--- Brian Powell
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