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.
Some coins are marketed in standard bullion sizes, like half ounce silver, one ounce silver etc, and some of those are also denominated as $1, for which see respective lists. This coin, denominated as One Niue Dollar, is not in a standard ounce-based size and is made using a "smartminting" technique - meaning that it has features not generally found in circulation coins.
This coin is part of the Endangered Animal Species series and features the Red Ruffed Lemur.
The Mint says about it:
"A coin from the series SOS to the World presenting the world's most interesting endangered animal species. The eighth coin from this remarkable collection is dedicated to one of the largest turtles which inhabits warm sea and ocean waters
The coin celebrates the beauty of wild nature and at the same time reminds us about the greatest care which should be given to species being at risk of extinction." | 
Search for Niue: One Dollar Silver 2014 Loggerhead Sea Turtle on eBay 
