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 - typically, one ounce of silver (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum).
This coin is the first release in the Solar System series of coloured proofs and features the Moon.
The Mint says about it:
The Moon, also known as Luna, is the only natural satellite of the Earth that shines on its sky most nights - not with its own light but with the reflected light of the Sun. As it orbits the Earth, the Moon rotates in such a way that only one of its hemispheres can be observed. It is covered with craters, mountains and "seas" - dark spots are formed by hardened lava. The moon is small and light. Therefore, its gravitational force is weak and can not hold an atmosphere. Yet it is constantly affecting the Earth while causing tidal effect - high and low tides of the seas and oceans. The coin was issued in 2019, 50 years since the first human stepped on the moon...
The reverse side of the coin was made by the author duo Asamat Baltaev, DiS., and Jiří Hanuš, DiS. It is dominated by the coloured depiction of the Moon together with an embossed depiction of the Earth. Photographs or computer graphics were not used for colouring - the authors created original watercolour paintings. The surface is characterised by a special treatment - a combination of proofing, sandblasting and using lasers resulted in a new effect that was entitled the “moon dust”. | 
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