The Australian half ounce silver piece (abbreviated as 1/2 oz and designated with Ag for "silver") is a bullion and commemorative coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
This silver half-ounce coin by the Perth Mint is intended as a Christmas gift.
The Mint says about it:
"Modern Christmas folklore tells the story of Santa Claus and his faithful reindeer, driving his sleigh through the night on Christmas Eve, delivering gifts to good boys and girls all over the world. The 2014 Christmas Coin celebrates the story of Santa Claus and his reindeer.
A first of its kind for The Perth Mint, this coin comes with a very special virtual reality feature! Using your smart phone or tablet, watch the story of Christmas come alive with Santa and his reindeer as they deliver the Christmas coin on Christmas Eve." | 
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