Reverse Along the upper edge arc: "20 CENTINI". In the central part is the coat of arms of Tonga. Below, the country name in English: "TONGA". Decorative dot elements are placed along the rim.
Obverse Along the upper edge arc: the name of King Taufa'ahau Tupou IV in English: "TAUFA'AHAU TUPOU IV". Below: "1974" - the year of mintage. In the central part - his right-facing profile.