20 and 50 cents 2001 - Centenary of Federation. By CAA | Wednesday, 22 November 2023. To celebrate the 100th anniversary of Federation, the Royal Australian Mint issued coins for each Australian state and territory with a reverse design represented by the coat of arms (50 cents) and other symbols and emblems.. Coin. Twenty Cents 2001 Donald Bradman. The Australian 20 cent coin was first introduced with decimalisation on 14 February 1966 when it replaced the pre-decimal Australian florin, to which it is equal in size and mass. The original common reverse design featuring a platypus by Stuart Devlin has not been changed since its introduction.

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Standard Catalog of World Coins / 2001-Date (14 th edition). Krause Publications, Stevens Point, Wisconsin, United States.. This Copper-nickel 20 cent coin was first released into circulation by the RAM in 1985. This coin has the standard Stuart Devlin Platypus reverse used since 1966 but was updated with the Ralph David Makleouf obverse.. The Australian 20c coin is made from 75% copper and 25% nickel (cupro-nickel), is 28.52mm in diameter and weighs 11.31grams. It has a reeded edge. The standard circulation design is the platypus by Stuart Devlin and was first issued in 1966 at Australia's changeover to decimal currency.