Issued by Indonesia, this 40 Sen commemorative stamp promotes the global fight against malaria under the slogan “The World United Against Malaria.” The design features a mosquito integrated with the international health emblem, symbolizing worldwide cooperation in disease eradication. Released during major WHO-supported anti-malaria campaigns of the mid-20th century, it reflects public health awareness through philately. The clean blue thematic layout represents medical unity and prevention efforts. A notable addition for collectors of medical, WHO, and social campaign issues.