The Australian Florin is a silver coin which was used in the Commonwealth of Australia prior to decimalisation. It has the same dimensions and composition as the British pre-decimal florin, from which it is derived (for a time, the coins circulated in parallel and were interchangeable in Australia - but not in the United Kingdom). A Florin is equal to two shillings, or 24 pence, or one tenth of a pound.
The reverse of the regular circulating Australian florin coins of the time features the 1912 Coat of Arms.
This is the third Australian circulating commemorative florin. It was issued to commemorate the fiftieth anniversary of Federation, 1901 - 1951.
The coins are made of 50% (0.1818 oz ASW).
After decimalisation on 14 February 1966, the florin was re-denominated as 20 cents and continued to circulate for a time, along with the new 20¢ coins which were the same size and weight (but made of copper-nickel). Even though they were practically withdrawn from circulation in 1966, the florin coins were never formally demonetised and are still legal tender. | 
