An Australian 2000 Olympic Five Dollar coin (A Sea Change 1 - Proof - 99.9% silver), in absolute mint condition could fetch up to $75 AUD. There were 0.1 million minted. An Australian 2000 Olympic Five Dollar coin (A Sea Change 2 - Proof - 99.9% silver), in absolute mint condition could fetch up to $55 AUD. There were 0.1 million minted. A reputable coin dealer will be able to give a more accurate valuation.
$20
the 3 coin proof set with 2 silver proof one dollar coins and one 10 dollar proof gold coin is worth about $550.00 retail the 3 coin proof set with 2 silver proof one dollar coins and one 10 dollar proof gold coin is worth about $550.00 retail
All years of issues of the Australian Two Dollar coin are still potentially in circulationso, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth Two Dollars.
The Australian One Dollar coin was first issued in 1984 and has not been around long enough to be either rare or valuable. These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth One Dollar. An Australian 2000 One Dollar coin, uncirculated and in absolute mint condition could fetch up to $50 AUD. There were 7.592 million minted.
An Australian 1989 One Dollar coin (Proof mint set only) could fetch up to $12 AUD. A reputable coin dealer will be able to give a more accurate valuation.
If you found it in change, it's 25 cents. The retail value of a single proof is about a dollar.
Australia does not issue coins for general circulation with any precious metal content. There was definitely no Australian 1984 "silver" Dollar coin. In most years, the Royal Australian Mint issues collector sets of Proof coins, often struck in a precious metal, but again, not in 1984.
An Australian 1993 Two Hundred Dollar 22 carat gold coin (UNC)(Squirrel glider), uncirculated and in absolute mint condition could fetch up to $420 AUD. There were 3,014 minted. An Australian 1993 Two Hundred Dollar 22 carat gold coin (Proof)(Squirrel glider), uncirculated and in absolute mint condition could fetch up to $440 AUD. There were 5,000 minted. Any valuation presumes that the coin is in the original packaging and remains in mint condition. A reputable coin dealer will be able to give a more accurate valuation.
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.
An Australian 1992 sterling silver Ten Dollar coin (QE II)(Bird series - Emperor Penguin)(Proof), in absolute mint condition and the original packaging, could fetch up to $35 AUD. There were 25,319 minted. An Australian 1992 sterling silver Ten Dollar coin (QE II)(Bird series - Emperor Penguin)(Proof Piedfort), in absolute mint condition and the original packaging, could fetch up to $70 AUD. There were 13,782 minted. A reputable coin dealer will be able to give a more accurate valuation.
These coins are potentially still in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth Two Dollars. An Australian 1988 copper-aluminium-nickel Two Dollar coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to $5 AUD. There were 160,852 million minted. An Australian 1988 copper-aluminium-nickel Two Dollar coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to $8 AUD. An Australian 1988 Two Dollar coin (Elizabeth II)(Proof in silver), in absolute mint condition could fetch up to $25 AUD. There were 0.045 million minted. A reputable coin dealer will be able to give a more accurate valuation. 1988 was the first year of issue of the Australian Two Dollar coin.
The only reference I can find to a 2007 Australian 1 Dollar coin featuring a Koala is to a pure silver 1 ounce coin with a current value of about $30 AUD. It would probably be suitably packaged in a case.