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). Many of these feature famous famous movie characters.
This coin featuring The Flash is part of an extensive New Zealand Mint series featuring DC Comics characters.
The Mint says about it:
The Fastest Man Alive arrives on a fantastic 1oz pure silver coin which showcases the hero in a powerful pose and with his lightning bolt emblem on the side. Enhanced with frosted finishing, this piece is definitely a sight for sore eyes! As legal tender, the effigy of Queen Elizabeth II can be found on the obverse.
In partnership with Warner Bros. Consumer Products, the packaging incorporates comic book style illustrations of the speedster. The box is lined with black velvet and encases this unique coin. A Certificate of Authenticity is printed at the back of the box with the coin’s unique number in a mintage of 5,000. | 
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