I don't think it is a team issued postcard. I collect Mantle postcards, and have seen Yankee stadium issue postcards from the 60s but never team issued. The stadium ones are labeled on the back. I might be wrong though. Possibly something from a street vendor?
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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