1 Dollar - Elizabeth II Charles Darwin

This coin was issued to mark the centenary of Darwin's death — wait, no: 2005 was the centenary of nothing directly Darwinian. It falls between anniversaries, which suggests it belongs to the broad wave of Pacific island collector issues that proliferated in the early 2000s, where Cook Islands, as a self-governing territory in free association with New Zealand, licensed its name to European minting houses producing themed bullion-adjacent pieces with minimal local connection.

The .500 silver specification is telling — half-fine alloy was a common cost-reduction measure in this collector series segment, keeping silver content nominal while supporting a higher retail price point.