Niue, a sovereign state in free association with New Zealand, uses two official legal tender currencies. The New Zealand Dollar is the circulation currency for daily transactions, while the government also authorises legal tender coins in the Niue Dollar currency for collector's purposes.
A number of mints issue a large variety of commemorative, bullion and collector coins under the authority of Niue. These coins are dedicated to historical or general popular culture themes not related to Niue itself. Many of them are in standard bullion sizes - for example, two ounces of silver (abbreviated as 2 oz Ag, where "Ag" comes from the Latin word for silver, Argentum).
This coin is part of The Punk Universe series, and features Dieselpunk.
The mint says about it:
Step into a world of technological innovation and futuristic vision with the third 2-ounce collector's coin from The Punk Universe series. Crafted from the highest quality 999 silver and weighing 2 ounces, this coin pays homage to the fascinating dieselpunk style - a genre of science fiction set in an alternate reality of the 1920s, 1930s, and 1940s.
Dieselpunk is a style full of contrasts - it combines technological advancement with the atmosphere of a bygone era. Modern inventions like cars, trams, telephones, and airplanes coexist with the spirit of hope for a better future after the Great War. | 
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