Twenty Australian dollars
An Australian 1987 fine gold 1/4 ounce Twenty-Five Dollar nugget coin (Elizabeth II), uncirculated and in absolute mint condition and the original packaging, could fetch up to $375 AUD. There were 13,692 minted. A reputable coin dealer will be able to give a more accurate valuation.
The Australian Koala series of coins were only ever minted in platinum and the Twenty-Five Dollar coin was only ever issued as part of a set.
The Royal Australian Mint never issued a Twenty Dollar coin until the 1990's and then usually in a mint set of bullion coins.
An Australian 1993 gold Five Dollar 1/20th ounce nugget (Elizabeth II)(Whiptail wallaby), uncirculated and in absolute mint condition and its original packaging, could fetch up to $75 AUD. There were 988 minted. A reputable coin dealer will be able to give a more accurate valuation.
The first Australian Dollar coin was issued in 1984.
1848. Silver. Twenty. Dollar. Coin
Such a coin would have been issued as part of a mint or proof set. Any value would depend on the metal it was struck from and the design of the coin.
There were no 1968 Australian Five Dollar notes printed.
There were no Australian Fifty Dollar notes printed in 1984.
The Australian Dollar was going for about $0.73 USD in late 1994. The Australian Dollar is currently going for about $0.93 USD as of 3-Dec-2009.
Twenty dollars