1 Dollar - Elizabeth II Eagle coin

Cook Islands has issued gold in fractional sizes under licensing arrangements that lean heavily on collector demand rather than any domestic monetary need — the islands' actual circulating currency is the New Zealand dollar. The five-nines (.99999) fineness here is noteworthy: it exceeds the standard four-nines gold used by most sovereign mints, matching the purity specification that the Royal Canadian Mint introduced for its Maple Leaf series in 2007, the same year this piece was struck.