Mayo Brothers Commemorative

United States · 1964 · 5¢

The stamp features a dual portrait of Dr. William J. Mayo and Dr. Charles H. Mayo, founders of the Mayo Clinic. It is rendered in green ink with the denomination '5¢' in the lower left corner.

Issued in 1964, this stamp honors the Mayo brothers, pioneering American surgeons who founded the renowned Mayo Clinic, recognizing their profound contributions to medicine.