The original Australian 1966 50 cent coin was made from 80% silver, and after the steep increases in the price of silver in the 1960's, the silver in the coin was worth more than the coin. It took only three 50 cent coins to make one ounce of silver. The coin was no longer cost effective to produce.
The 1967 issue was halted and the coins melted down.
The next, and all subsequent Australian 50 cent coins were dodecagonal and made from cupro-nickel. The change in shape was to make them more distinguishable from the slightly smaller 20 cent coin.
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
The Australian 5 cent coin has an echidna on it?
Australian five-cent coin was created in 1966.
Australian twenty-cent coin was created in 1966.
The Australian 1966 50 cent coin was the first and last round Australian 50 cent coin produced by the Royal Australian Mint. With the wisdom of hindsight, this coin was a bit of a blunder on the part of the Royal Australian Mint. It was only very slightly larger in size to the Australian 20 cent coin and it had an 80% silver content at a time when the price of silver was increasing rapidly. It took only three of these coins to get one ounce of silver.
There is no flower on the reverse of an Australian 50 cent coin.
Such a coin does not exist. The first Australian 10 cent coin was issued in 1966.
The Australian 20 cent coin features a platypus on the reverse.
Such a coin does not exist. The Australian 2 cent coin was first issued in February 1966.
The lyrebird is on an Australian ten cent coin.
The Australian 2 cent coin was introduced at the changeover to decimal currency in 1966. There were no Australian "cent" coins minted prior to 1966.