Lot of two: an FDC with a cachet commemorating the 100th Anniversary of the founding of the American Medical Association, signed by Sabin and Salk in black ink; FDC with a cachet honoring ‘Science - Organized Common Sense,” signed in black felt tip by Jonas Salk. In overall fine condition, with show through to the Salk signature area on the second from toning on reverse. R&R COA.
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