2015 $25 Australia Sovereign Gold Proof CoinThe discovery of payable gold in the colony of New South Wales in 1851 lay behind the establishment of the Sydney branch of the Royal Mint, which opened on 14 May 1855. The Sydney Mint produced its first Type I sovereign, featuring a unique colonial design, on 23 June. This commemorative coin portrays St. Edwards crown, a laurel wreath and the word AUSTRALIA, historic elements of Leonard Charles Wyons original Type I reverse. The modern tribute also