20 Seniti - Taufa'ahau Tupou IV FAO

Issued under the FAO coin program, which ran from the late 1960s through the 1990s as a United Nations Food and Agriculture Organization initiative to promote agricultural awareness through circulating coinage. Tonga participated across multiple denominations and years, with member nations essentially given design latitude so long as the FAO theme was incorporated. The program was more successful as a numismatic exercise than a public education campaign — most issues were absorbed by collectors before they reached general circulation.