100 Pa'anga - Taufa'ahau Tupou IV Jubilee of Accession

Taufa'ahau Tupou IV ascended to the Tongan throne in 1965 following the death of his mother, Queen Salote, who had ruled for nearly half a century and become internationally known after her open-carriage appearance at Elizabeth II's coronation in 1953. By 1990, his 25-year jubilee coincided with a period of growing pressure for political reform in Tonga — pro-democracy movements were beginning to challenge the kingdom's feudal constitutional structure in ways that would accelerate sharply through the following decade.

The .583 fineness — 14-karat gold — is characteristic of Tongan commemorative issues from this period, chosen to keep face-value ratios commercially viable for the international collector market.