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 coins under the authority of Niue. Most of these are commemorative and collector issues 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). Those issued at prices much higher than their bullion value are separately listed in the Non-Circulating Legal Tender (NCLT) silver ounce section of the site.
Unlike them, this coin is targeted at bullion investors and was initially released at a price close to the value of its precious metal content.
Back to the Future is an American science fiction comedy film released in July 1985 and starring Michael J. Fox as Marty McFly, a high school student who accidentally travels 30 years into the past to 1955, jeopardising his own future existence.
The coin is produced under licence by The Coin Company Australia as legal tender under the authority of Niue. | 
Search for Niue: Silver Ounce 2020 Back to the Future on eBay 