5 Dollars - Elizabeth II Poseidon

Niue has operated as a prolific bullion and commemorative issuing authority since the 1990s, leveraging its status as a New Zealand realm territory with independent currency rights to contract with private mints — primarily the Perth Mint — for collectible issues sold wholesale into the international numismatic market. The arrangement generates revenue for the island's government, whose population hovers around 1,500 people, far too small to sustain any meaningful domestic coin circulation.

This two-troy-ounce format places it squarely in the high-premium collector bullion category rather than any circulation or monetary function.