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, or are based on the troy ounce - for example, three ounces of silver (abbreviated as 3 oz Ag, where "Ag" comes from the Latin word for silver, Argentum).
This coin featuring Aquaman is part of an extensive New Zealand Mint series featuring DC Comics characters.
The Mint says about it:
One of the most powerful Super Heroes of the DC Universe, Aquaman is known for his incredible superhuman strength, telepathy, and exceptional swimming abilities.
Monarch of the undersea realm of Atlantis and King of the Seven Seas, Aquaman has now propelled onto this 3oz pure silver coin, as part of our DC Classic Coin Collection. Engraved on the face of the coin is a powerful image of Aquaman standing strong, holding his Trident. Illustrated behind is a detailed comic montage featuring other images of the hero. Engraved to the side is his emblem and him speeding through the water, with a mirror-finish background. To confirm the coin’s legal tender, the obverse displays the Ian Rank-Broadley effigy of Her Majesty Queen Elizabeth ll.
Created in partnership with Warner Bros. Consumer Products, this special piece arrives in custom-designed packaging featuring artwork of the Atlantean king. The box is lined with black velvet and the coin is encased in an acrylic capsule, protecting it from the archenemy. Printed on the back is a Certificate of Authenticity and the coin’s unique number in the limited mintage of 1,000. | 
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