20 Dollars - Elizabeth II Olympic National Park

Issued as part of the wave of large-format silver pieces that flooded the collector market in the mid-1990s, this coin commemorates Olympic National Park in Washington State — a somewhat unexpected subject for a Cook Islands issue, reflecting the era's broad licensing of American national subjects to Pacific island minting programs seeking hard currency revenue.

At 155.52 g, the planchet is a 5-troy-ounce format, a size popularized during this period largely by the Perth Mint and quickly adopted by numerous issuing authorities with limited domestic minting infrastructure.