The Tuvaluan Dollar is the currency of Tuvalu - a small nation in the Pacific Ocean. Tuvalu has never had banknotes of its own, and has been issuing coins since 1976; these circulate together with coins of the Australian Dollar, which is also legal tender in the country, and to which the Tuvaluan Dollar is pegged.
The Australian Perth Mint issues a large variety of non-circulating legal tender (NCLT) coins under the authority of Tuvalu. Some of these are in the one dollar denomination, and have the same specifications that the mint uses for its large non-circulating Australian dollar range; these are larger than the normal circulating dollar coins.
This coin was issued in celebration of the Chinese New Year 2019 (5 February 2018).
The Mint says about it:
This beautifully coloured silver coin celebrates Chinese New Year, one of the most important celebrations for Chinese people across the globe. A time for families to reunite and honour deities and ancestors, Chinese New Year traditions celebrate auspicious symbols of wealth, good fortune and success such as the revered dragon. Chinese New Year dragon dances usher in good fortune with colourful and energetic performances that recreate traditional imagery, including the dragon chasing a flaming "pearl of enlightenment".