Keywords: 1964coverDoctorsMayo.jpg en First day cover of the United States Postal Service stamp depicting Charles Horace Mayo and William James Mayo postmarked 11 September 1964 in Rochester Minnesota The stamp was designed after a bronze statue of the Mayo brothers by James Earle Fraser It was was released prior to 1978 and is therefore public domain 221548666482 en United States Post Office Department 1964-09-11 1964 stamps of the United States James Earle Fraser Charles Horace Mayo William James Mayo Mayo Clinic Groups of people on stamps First day covers of the United States PD-USGov |