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Although the Australian 2 cent coin was withdrawn from circulation in 1994, they are still legal tender and are worth 2 cents. There are two Australian 2 cent coins that are considered to be valuable, the 1967 and 1968 coins, both minted at the Perth Mint. What makes them valuable is the missing designers initials (SD) below the lizard and to the left of the front right claw.
No general circulation Australian decimal coin could be considered to be valuable. Any 1981 coin in absolute pristine mint condition might get $2 to $4, otherwise, they are worth face value. There is one variation, the 1981 20 cent coin minted at the Royal Canadian Mint Winipeg, shows the platypus with three and a half claws. These may have some collector value.
Yes but you probably won't get much for it. Generally Roman coins go for $50 to $100 USD. A coin specialist can tell you specifics.
on the Australian 20 cent coin it the platypus
After the abolition of the Guilder, the new most valuable coin would be the 2 Euro 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.
Put a picture of the coin!
The Australian 5 cent coin has an echidna on it?
These coins are no longer in circulation, but 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 1 cent. The most valuable Australian general circulation 1 cent coin would be the 1968 coin which, uncirculated and in absolute mint condition might fetch up to $28 AUD. There were 19.93 million minted. A reputable coin dealer will be able to give a more accurate valuation.
Such a coin does not exist. The Australian 1 cent coin was first issued in 1966. The Australian One Penny coin was issued from 1911 to 1964 inclusive.
There is no documentary evidence I can find of a 1938 Australian Crown (Five Shillings) with a "double rim" fault. The 1938 Australian Crown is a sought after collectible coin and only about 101,000 were minted. Many have been melted down for the silver. If the coin and/or the fault is genuine, a double rim fault would certainly increase its value. A reputable coin dealer will be able to verify the coin and give a valuation.
The first Australian Dollar coin was issued in 1984.