Yes. The Australian 50 cent coin has been issued in every year except 1967 and 1968.
Such a coin does not exist. The last Australian 1 cent coins were issued for circulation in 1990. They were progressively withdrawn from circulation in 1992.
Such a coin does not exist. The first and only round Australian 50 cent coin issued for circulation was issued in 1966. There was a round commemorative Proof coin issued in 2006, but not for circulation.
There are no Australian 5 cent coins minted for general circulation that could be considered to be rare. Australian 5 cent coins, in all years that they were minted, 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 5 cents.
The Australian 1 cent coin, along with the 2, 5, 10, 20 and 50 cent coins, were first issued on the 14th of February, 1966 for the introduction of Australia's decimal currency. The last Australian 1 cent coins were issued for circulation in 1990 and they were progressively withdrawn from circulation in 1994.
With the exception of the 1966 round 50 cent coin, all issues of the Australian 50 cent coin are potentially still in circulation, so unless they are Mint Uncirculated, not much more than face value. A reputable coin dealer will be able to give a more accurate valuation.
Yes, the 10 cent coin is smaller. The Australian 10 cent coin is 23.60 mm in diameter. The Australian 20 cent coin is 28.52 mm in diameter.
on the Australian 20 cent coin it the platypus
No, they are not especially rare. There were 36.252 million issued. They have the dubious distinction of being the most hoarded Australian coin, since they were removed from circulation in 1967 after the price of silver skyrocketed. The next 50 cent coin issued in 1969, was made from cupro-nickel and had 12 sides, as have all Australian 50 cent coins since then.
The 1989 50 cent coin was not released into circulation but was only available in a mint set. It valued at around $15-$20
The Australian 5 cent coin has an echidna on it?
A very common coin still in circulation, just spend it.
A very common coin still in circulation, just spend it.