100 Dollars - Elizabeth II Platypus

Niue has been a prolific vehicle for novelty bullion since the early 2000s, its sovereignty-for-hire arrangement with private mints producing hundreds of collector issues under the Cook Islands and Niue imprimaturs. This platypus piece belongs to that tradition — a one-troy-ounce fine gold coin with selective platinum plating over specific design areas, a technique that requires masking during the electroplating process and adds meaningful production complexity beyond standard proof striking.

The platypus itself is a recurring subject in Australian-themed numismatic issues from this region, though the platinum plating treatment distinguishes this from the Perth Mint's own platypus series.