This coin was only ever issued as part of a boxed five coin set.
The Australian 1996 Five Dollar 1/20 ounce gold nugget, in mint condition and the original packaging might fetch up to $80 AUD.
There were 350 issued.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1990 Five Dollar 1/20th ounce gold nugget, and in absolute mint condition and original packaging, could fetch up to $75 AUD.
There were 6,589 minted.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1989 Five Dollar 1/20oz gold nugget, in absolute mint condition and packaging could fetch up to $75 AUD.
There were 20,340 minted.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1986 One Hundred Dollar Proof 1 ounce gold nugget, in absolute mint condition could fetch up to $1,250 AUD.
There were 3,000 minted.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1992 Five Dollar 1/20 oz gold nugget (Nailtailed wallaby), uncirculated and in absolute mint condition and original packaging, could fetch up to $60 AUD.
There were 1,160 minted.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1999 gold 1/20th ounce Five Dollar coin (QE II), in absolute mint condition and in the original packaging, could fetch up to $90 AUD.
These coins were only issued in sets.
A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1995 gold 1/20th ounce Five Dollar coin (Elizabeth II), in absolute mint condition and in the original packaging, could fetch up to $120 AUD.
These coins were only issued in sets.
A reputable coin dealer will be able to give a more accurate valuation.
There were 988 minted.
A reputable coin dealer will be able to give a more accurate valuation.
You do not provide sufficient information to identify the coin, but there were only a few years in which a 1 Kg gold nugget coin was issued.
The current going rate is $42,000 AUD.
The Royal Australian Mint never issued a Twenty Dollar coin until the 1990's and then usually in a mint set of bullion coins.
As of February 2012 the bullion value is $832.24.
The Australian 2004 Twenty Five Dollar 1/4 ounce gold nugget, in mint condition and the original packaging might fetch up to $385.50 AUD. There were 250 issued. A reputable coin dealer will be able to give a more accurate valuation.
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.
There were no 1968 Australian Five Dollar notes printed.
There were no Australian Fifty Dollar notes printed in 1984.
Twenty Australian dollars
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.
A 2003 American Eagle Bullion Dollar in MS65 condition is: $24.00.
The 5 Dollar American Eagle coin regardless of date is a 1/10th oz Gold Bullion coin and as I type this the value is $108.10 The value of any gold bullion coin follows the spot price of gold.
The first Australian Two Dollar coin was issued in 1988.