The standard issue non-commemorative Australian 50 cent coin is covered in stars if your eyesight is good enough to pick them out.
Nine are incorporated into the shield design. Each component of the Shield represents one of the 6 states. The top left portion represents New South Wales and contains 4 stars, the top centre portion represents Victoria and contains the 5 stars of the Southern Cross.
The large star at the top in the centre is the seven pointed star of Federation. One point represents each of the States and the seventh point represents the Territories.
Various commemorative 50 cent coins have various representations of the Australian flag which show the Southern Cross constellation consisting of 5 stars plus the Federation Star, sometimes referred to as the Commonwealth Star. Other 50 cent coins show the Southern Cross constellation consisting of 5 stars.
The 5 cent coin is smaller in diameter than the Two Dollar coin. The Australian 5 cent coin is 19.41 mm in diameter. The Australian Two Dollar coin is 20.62 mm in diameter.
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 original Australian one dollar coin, which was introduced on 14 May 1984, features five kangaroos.
An Australian 2008 Five Dollar coin (Bradman's 100th Birthday), uncirculated and in absolute mint condition could fetch up to $25 AUD. There were 4,700 minted. A reputable coin dealer will be able to give a more accurate valuation.
Australian five-cent coin was created in 1966.
Depending on the year of issue, the particular design, where it was issued and whether it is "Proof" or "Mint Uncirculated", an Australian Five Dollar 1 oz silver "Kookaburra" coin, might fetch anything from $35 to $65 AUD. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 2008 sterling silver Five Dollar coin (Scouts Australia Centenary)(Proof), uncirculated and in absolute mint condition could fetch up to $95 AUD. There were 5,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
There were no 1968 Australian Five Dollar notes printed.
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.
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.
On 21 June 2013, a second commemorative 2 dollar coin was launched by the Royal Australian Mint. This coin, commemorating the 60th anniversary of the coronation of Queen Elizabeth II, featured a purple circle bordering St Edward's Crown.
NOTE - Australian Five Dollar coins are non-circulating legal tender (NCLT) commemoratives and are issued for the collector market. An Australian 1988 copper-aluminium-nickel Five Dollar coin (Elizabeth II)(Australian Bicentenary commemorative), uncirculated and in absolute mint condition and the original packaging, could fetch up to $12 AUD. There were 3 million minted. An Australian 1988 copper-aluminium-nickel Five Dollar coin (Elizabeth II)(Australian Bicentenary commemorative)(Proof), uncirculated and in absolute mint condition and the original packaging, could fetch up to $30 AUD. There were 124,804 minted. The coins have a gold appearance are composed of 92% copper, 6% aluminium and 2% nickel, weigh 28 grams and are 38.5 mm in diameter. I am not sure what you mean by "unminted 1988 5 coin". A reputable coin dealer will be able to give a more accurate valuation.