The Australian Dollar coin was first issued in 1984.
There was a One Dollar coin minted in 1967, but it was not for general circulation, and it is not even regarded as an official Australian coin. It was known as the "Swan Dollar".
It was a very limited mintage, Proof coins in silver and gold specifically for collectors.
The obverse depicts a swan in flight, the with the word "Australia", a crown and 1967.
The reverse has a design of Australian flora with a large 1.00 across the coin.
In their original condition and packaging, the silver coins could get up to $1,000 AUD. The gold coins could get up to $12,000 AUD. Only ten were minted and two are known to have been destroyed in the Ash Wednesday bushfires.
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The Australian Two Hundred Dollar coin in not a circulating coin, it is minted for investors and collectors and are issued with some sort of theme associated with them.
Most commonly, they are 22 carat or 91.67% gold.
Some were produced as 24 carat or 99.9% pure gold.
Whatever they are, the specific details will be written on the packaging they are issued in.
No circulating Australian decimal coin has any silver content.
The only Australian decimal coin to ever have silver in it was the 1966 50 cent coin.
It was recognised to be an error of judgement very quickly when the price of silver soared in 1967 and the coin was withdrawn from circulation almost overnight, since the silver in the coin had become worth much more than 50 cents.
The Australian 1966 50 cent coin was made from 80% silver and 20% copper.
All subsequent Australian 50 cent coins from 1969 onwards have been made from 75% copper and 25% nickel and are 12 sided.
Apart from the 1966 50 cent coin which had an 80% silver content, no Australian general circulation decimal coin has any silver at all.