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Twenty Cent

1966 - 2006

Type I

The Type I twenty cent was issued from 1966 to 1984 with an additional proof striking in silver in 2006 as part of the 40th anniversary of decimal coinage set. The reverse features Stuart Devlin's platypus design and the obverse features Ian Rank-Broadly's portrait of HM Queen Elizabeth II.

The issue was struck at the Royal Australian Mint in all years with additional assistance provided by the Royal Mint London in 1966 to address the huge demand for new currency as a result of the vast amount of pre-decimal currency withdrawn. To distinguish between the 1966 London and Canberra coins one must look closely at the point of the wave near the platypus' head. There is no gap (or a very small gap) between the swirl and the head it is the London coin and a distinct gap on the Canberra one. Unfortunately a slightly weaker strike on one of the London minted coins can lead to a small gap causing confusion.

No gap between swirl point and platypus indicates that this 1966 piece was minted in London.

Gap between swirl point and platypus indicates that this 1966 piece was minted in Canberra.

In 1981, the Wales mint assisted with striking coins to meet the additional demand for circulation currency brought about by the economic boom of the 1980s.

A coin struck from specially prepared dies to strike a superior quality coin not intended for circulationCurrency in equivalent units of base 10The tails side of the coinThe heads side of the coinDenominations without base 10 equivalentsa facility that produces coins

 MintageAU50AU55AU58MS64MS65MS66MS67MS68MS691966 Sans Gap30,067,2507.3013206479933406908001966 Wavy 2 baselineIncl. in above7208208801,8004,5008,0008,9009,50010,0001966 Gap28,234,6594.407.90123450593003904401967 83,847,0002.604.406.602746733704805501968 40,537,0009.4017291001202208001,4001,5001969 16,551,1764.408.101234371004806307101970 23,761,2303.706.7010273341532703501971 8,975,5724.307.80123353741305006401972 16,682,0653.205.708.70234246797809201973 23,386,9283.506.209.402534421805406701974 33,573,4754.50812334048532603501975 53,330,1212.704.506.50151832522603401976 59,814,0043.205.608.20202429433507101977 41,400,0102.203.705.30121423412002701978 37,502,0062.303.805.40121424291501901978 MuleUnknown         1979 22,370,0063.205.608.20202427432102801980 84,457,0002.704.606.80161925402002601981 Four claws115,623,0002.804.706.90161931417701,3001981 Scalloped Edge8 known         1981 Three and a half claws50,000,00071321681104906307207801982 76,799,9502.704.606.80161822331702201983 55,268,700*4.307.80123441452303003401984 27,970,014*4.107.301131424651380590 MintagePR65DCAMPR66DCAMPR67DCAMPR68DCAMPR69DCAMPR70DCAM1966 London Mint ProofUnknown      1966 Proof18,066455566814608301969 Proof13,056495460662405901970 Proof15,36826314448693501971 Proof10,066384554601204901972 Proof10,272303543511004801973 Proof10,090172125902205701974 Proof10,91824465055964801975 Proof23,02119233134522601976 Proof21,20015182125362301977 Proof55,00616192227345101978 Proof38,51915182022316301979 Proof36,00628293438412901980 Proof68,00018222427332901981 Proof86,10016192333361201982 Proof100,00016192023271901983 Proof80,00021253033431601984 Proof61,00023242932441702006 Silver Proof5,82941424446230300Values are in AUD and are retail price estimations based on past sales of coins certified by PCGS or NGC and as such values only related to such graded coins. Uncertified coins or coins graded by other services would likely be worth significantly less. For wholesale pricing please refer to the Red Sheet. While all attempts to ensure accurate pricing, data entry errors can occur and as such no warranty is expressed or implied as to the accuracy of any information published on this website. It is important to verify all published sales to ensure the accuracy of the pricing when making any purchase decision. Any personal information provided to us is protected by the Privacy Act 1988.