2007 $5 Fine Silver Proof Coin, 150 Years of State Government-South Australia. From its origins as a colonial administrative body, the South Australian Legislative Council joined with a newly created House of Assembly to inaugurate responsible government in the colony. The new Parliament first met on 22 April 1857.0 This proof quality coin celebrates the 150th anniversary of that event. Struck in Fine Silver by the Royal Australian Mint, the coin is one of a series commemorating milestones in Australian State Government. Mintage 12,500. Certificate of Authenticity is included with this set numbered 661. Please contact Adelaide Exchange Jewellers to find out more on this item.