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RhysThe DiMaggio signature looks like a classic example of his sisters secretarial work. Most items sent to DiMaggio through the mail in the 1970's were signed by Sister. It probably helps to date the Mantle as well to that time period as it looks slightly older than his card show era signatures of the 1980's and 1990's. I would say that without looking at it in person that the Mantle looks good and that the DiMaggio was probably obtained through the mail and signed by his sister.
Rhys Yeakley