Issued in 1966 by the Republik Indonesia, this semi-postal stamp (40 + 10 sen) beautifully depicts the Hibiscus rosa-sinensis, locally known as Kembang Sepatu, Indonesia’s national flower. The vivid red blooms symbolize courage and grace, captured in rich engraving detail. The additional 10 sen surcharge supported social welfare causes, making this stamp both artistically and philanthropically significant. A cherished collectible from Indonesia’s mid-20th-century floral series, it stands out for its bold color printing and cultural symbolism.