There were no Australian gold proof coins minted in 1984. Perhaps you refer to the One Dollar coin which is an aluminium bronze alloy and has a gold appearance. An Australian 1984 1 Dollar coin (Proof), uncirculated and in absolute mint condition could fetch up to $6 AUD, or maybe $10 AUD if it was in the presentation pack. A reputable coin dealer will be able to advise a more accurate quotation.
August 29, 2009 The 1988 Olympiad proof dollar has a value from $18 to $40 depending upon the actual condition of the coin. The $5 Olympic gold coin has a value from $225 to $300 depending upon the actual condition of the coin.
The Australian Two Dollar coin is made from copper, aluminium and nickel and is of a gold appearance. Very occasionally, some Proof coins are made from silver and issued in sets. The 2000 $2 coin was not one of these. If you have a silver $2 coin, it has been plated. Modified coins are worthless as a collectible.
~$10
There were 1,000 1988 Isle of Man Proof gold "One Angel" coins minted.
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A 1988 U.S. proof set has a retail value of $8.00 issue price was $11.00
None. There were 201 1992 Australian 1/4 ounce $25 Proof gold nuggets featuring the Nailtailed Wallaby minted. There were 210 1993 Australian 1/4 ounce $25 Proof gold nuggets featuring the Whiptail Wallaby minted.
An Australian 1990 1/10th oz (Proof) gold nugget (Grey kangaroo), uncirculated and in absolute mint condition and original packaging, could fetch up to $160 AUD. There were 2007 minted. A reputable coin dealer will be able to give a more accurate valuation.
One dollar...
I cannot find any reference to an Australian gold coin from any year with an eagle on it. Do you have any further information?
"1988: Duncan Armstrong Wins the Gold at the Summer Olympics". Armstrong was the only Australian man to win a gold medal at the 1988 games; he won in 200 meter freestyle swimming.
There is no record of the Royal Mint having produced a "gold" Proof set in 1974, only the usual Proof set. Royal Mint gold Proof sets issued from 1980 contain only the "Sovereign" coinage.