100 Dollars - Elizabeth II Echidna

Niue's coinage program is essentially a licensing operation — the island territory issues face value in name only, with New Zealand handling its actual currency needs. The echidna piece belongs to a broader Australian wildlife series produced for the collector market, almost certainly struck at the Perth Mint under contract. The selective platinum plating over .9999 gold is a technical flourish that requires precise masking during the plating process, and adhesion quality varies enough across the run that long-term surface integrity is a legitimate concern for registry-grade examples.