Physicians Charles H. Mayo (1865–1939) and William J. Mayo (1861–1939) worked together in the family’s medical practice, which eventually evolved into the famed Mayo Clinic in Rochester, Minnesota. Ink signatures, “C. H. Mayo,” and “W. J. Mayo,” on individual off-white 3.25 x 2.5 cards. In fine condition, with a few mounting remnants to a couple of corner tips. RR Auction COA.
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