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Dodecagonal Type I

1966 - 84

The dodecagonal type I fifty cent was issued to replace the round 1966 fifty cent from 1969 to 1984 with a number of patterns dated 1966 and 1967. It is struck on a dodecagonal planchetwith the Arnold Machin portrait of HM Queen Elizabeth II on the obverse, and Stuart Devlin's interpretation of the Australian coat of arms on the reverse. Devlin's initials (SD) can be found on the bottom of the reverse underneath the denomination. The type was struck exclusively at the Royal Australian mint in Canberra.

Initials of artist Stuart Devlin (SD) on a 1974 Proof Fifty Cent piece.

A coin struck as a representation piece of a coin that never eventuatedThe piece of metal a coin is struck onThe tails side of the coinThe heads side of the coin

 MintageAU50AU55AU58MS64MS65MS66MS67MS68MS691969 14,046,1766.907.507.9053671304806207001971 21,084,5724.407.40103440591705106401972 5,625,0658.90162657701104706106901973 4,039,9286101473871204506307201974 8,987,5955.308.70122872801304806201975 19,094,9214.807.80112429421204706101976 27,320,0043.405.307.101449541705106401978 25,835,0064.908112533643204204801978 MuleUnknown         1979 24,956,2064.507.3010222730371802401979 Double BarIncl. in above         1980 38,781,0004.306.909.502028422102803101980 Double BarIncl. in above7.1012184148532703503901981 24,288,0004.507.3010222628904505901983 49,078,7004.306.909.602022261104706101984 26,431,0143.2056.6013202633170220 MintagePR65DCAMPR66DCAMPR67DCAMPR68DCAMPR69DCAMPR70DCAM1969 Proof13,0566784931006901,2001971 Proof10,066475662681605001972 Proof10,27270841001203106401973 Proof10,090576780963406801974 Proof10,918384551711805201975 Proof23,02121242935633201976 Proof21,20023273235469401978 Proof38,51916182131387001979 Double Bar Proof36,0066475891001209901979 ProofIncl. in above21222631399701980 Proof68,00017192932407701981 Proof86,10016192123419001983 Proof80,00021242631376901984 Proof61,0001315171940850 Mintage1966 PatternUnknown1967 PatternUnknown1967 Uniface Obverse PatternUnknown1969 Specimen2,0001977 Pattern7 KnownValues 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.