This classic Rp1 definitive stamp from Indonesia features a left-facing portrait of President Sukarno, the founding leader of modern Indonesia. Issued in 1966, the design reflects the transitional political period following Sukarno’s presidency. Printed in a simple yet elegant green and black two-tone style, the stamp emphasizes national identity with the inscription “Republik Indonesia.” The small pentagon marking containing 1966 denotes the year of issue within the series. Such Sukarno definitives are popular among collectors of Asian political history, presidential portraits, and Indonesia’s early republican postal issues.