2 Pa'anga - Taufa'ahau Tupou IV Humpback Whale

Tonga issued this piece as part of a broader Pacific conservation push in the late 1970s, when humpback whales — particularly the Oceania population that winters in Tongan waters — were still recovering from near-extinction following decades of commercial whaling. The International Whaling Commission's 1966 protection of humpbacks had only recently begun to show measurable population results, and several Pacific island nations used commemorative coinage as a vehicle for asserting both environmental concern and a degree of international visibility they couldn't project through other means.

Tonga's whale-themed issues of this period are frequently encountered in original packaging, suggesting limited circulation intent from the outset.