5 Dollars - Elizabeth II Battle of Britain

Niue has operated as a prolific bullion and commemorative licensing partner since the 1990s, effectively selling its monetary authority to outside mints — in this case, the coin was produced by the New Zealand Mint as part of a broader WWII anniversary series. The Battle of Britain ran from July to October 1940, the first major military campaign fought entirely by air forces, and its outcome directly determined whether a German land invasion of Britain remained operationally viable.

At 3.11 g of .9999 gold, this is a quarter-ounce equivalent — a standard bullion fractional size that keeps the nominal five-dollar face value purely nominal against Niue's GDP.