Issued in 1972, this Philippine commemorative stamp highlights the 4th Asian Pacific Congress of Gastroenterology, held in Manila from February 5–12, 1972. The design features a detailed medical illustration of the human digestive system, emphasizing scientific progress in gastroenterology within the Asia-Pacific region. The bold “Pilipinas” inscription and congress text provide a clean, conference-oriented layout, while the 20-sentimo denomination appears in stylized typography. A notable thematic item for collectors of medical history, Asian regional events, and Philippine commemoratives of the late Marcos-era period.