5 Dollars - Elizabeth II Posthumous, Sparta

Cook Islands has issued commemorative platinum fractionals under self-governing authority since the 1970s, operating a mint program largely detached from any domestic monetary need — the islands' actual currency is the New Zealand dollar. The Sparta theme places this within a broader ancient civilizations series aimed squarely at the fractional bullion collector market.

Struck after September 2022, this is among the first Cook Islands issues to carry the posthumous effigy of Elizabeth II, following her death before the series completed production.