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Issued in 1964, this U.S. 5¢ green stamp honors Dr. William Worrall Mayo and his sons, Dr. William James Mayo and Dr. Charles Horace Mayo—pioneers of modern medicine and founders of the renowned Mayo Clinic. The stamp features sculptural busts of the doctors in profile, symbolizing their legacy in advancing healthcare and surgical techniques. A caduceus appears on the lower left, reinforcing the medical theme. This commemorative stamp was part of the Prominent Americans Series.
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