World Meteorological Organization

The World Meteorological Organization (WMO), or Organisation Meteorologique Mondial (OMM) is indeed involved with the study of weather and climate, but also extending to hydrology and geophysics. Its roots go back to 1873 with the International Meteorological Organization, exchanging weather data and research. It acquired its current name in 1947 when it became an agency of the United Nations.

Headquartered in Switzerland, it was given franking power and began issuing its own stamps in 1956. 
 * Its first issue was engraved with designs of weather elements or weather equipment. It was inscribed ORGANISATION METEOROLOGIQUE MONDIAL with HELVETIA.
 * In 1973, a design with the agency's logo was issued. A commemorative for the organization's 100th anniversary was issued with a slightly different inscription.
 * The agency probably uses United Nations Geneva stamps today.



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