2013 Birds of Australia Budgerigar 1/2 oz Silver Proof. 999 Coin w/ Box & COA?? The 1/2 oz 2013 Birds of Australia Budgerigar Silver Proof. It comes from my personal collection. This coin has always been stored properly in a dry, temperature controlled room. Please use the photos provided for reference, it appears to be in excellent condition. Usually the same day or next day depending on the time of sale. The 2013 Birds of Australia Budgerigar 1/2 oz Silver Proof. 999 Coin features a stunning design of a budgerigar, a popular bird native to Australia. This beautifully struck coin is made of 99.9% silver and comes with a box and certificate of authenticity from The Perth Mint. With a limited mintage, this coin is a valuable addition to any coin collection or investment portfolio.