New Zealand uses the New Zealand Dollar as its circulation currency for daily transactions. The country also issues a number of commemorative and collector coins, including in the internationally popular one ounce of silver format (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum). Authorised by the Reserve Bank of New Zealand, the official issuer of these coins is NZ Post - which also issues the country's postal stamps. Manufacturing of the coins is commissioned to various foreign mints.
The coins are "Non-Circulating Legal Tender" (NCLT) and not bullion because they are issued at prices much higher than their intrinsic value and are targeted at collectors who appreciate them for their artistic or sentimental value, and not at bullion investors.
New Zealand has the tradition of issuing one "main" large commemorative per year, and this coin is the 2018 New Zealand Annual Coin, featuring the Moa bird.
NZ Post says about it:
Moa are classified as part of the ratite group of birds, along with the emu, ostrich and kiwi. As they evolved in isolation from the rest of the world, and essentially without predators, the name of the living ratite to which they were more closely related has long been debated. For a long time it was thought to be the kiwi, but DNA testing has shown that the moa were most closely related to the small tinamous of South America - a surprising result indeed.
These giant herbivores were prevalent across New Zealand’s mainland as well as on offshore islands such Great Barrier and Stewart. On coastal dunes, in swamp lands and dense forests and all the way up to sub-alpine zones around 2,000 metres above sea level, moa browsed on a wide variety of foliage including flowers, trees and berries.
This 1oz silver proof coin minted from 0.999 silver has a stylised image of a moa in one of its more common habitats. It’s thought that multiple species of moa would have shared similar regions and browsing areas. Here the moa is depicted in a southern landscape; snow-capped peaks in the background can be seen as it emerges from dense native bush. An etching-like technique was used by talented artist Dave Burke to create this unique and highly detailed scene. | 
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