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 2021 (1 February 2022).
The Mint says about it;
Marking a range of popular anniversaries, events and themes, commemorative Stamp and Coin Covers combine a Perth Mint one dollar coin and one or more Australia Post stamps on a superbly illustrated envelope. This 2022 Happy Chinese New Year release is postmarked "First Day of Issue 6 January 2022 Christmas Island WA 6798". | 
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