Issued by Indonesia in 1966, this definitive stamp features a classic side-profile portrait of President Sukarno, one of the nation’s founding leaders and its first president. Printed in a refined green tone, the design highlights the traditional peci cap, symbolizing Indonesian national identity. The modest Rp 1.50 denomination reflects everyday postal usage of the period, making it a key component of mid-1960s Indonesian definitive sets. Clean portrait definitives of Sukarno remain historically significant and are sought after for thematic collections focused on world leaders, independence movements, and Southeast Asian postal history. Well-centered examples are particularly desirable for album completion.