50澳分硬币首次提出采用十进制14与二月1966。原设计精选联邦国徽上的80%的银硬币
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。白银价格上涨高于面值的硬币在1967和引人注目的硬币是悬浮在3月1968。虽然有传言说澳大利亚皇家造币厂已失去了金钱，打击这些硬币，金属用于制造36500000枚硬币生产之前购买价格上升。
除了经济成本继续发行的银50澳分，显着的负面评论产生混乱的圆形的20澳分硬币。决定补发50澳分硬币不仅考虑改变不同形状的材料也帮助解决混乱的20澳分。一个新的形状和合金是重新进入流通九月1969。
标称规格
19661969-present
作文80%银20%铜组成75%铜镍25%
形状圆形十二角
边磨边平原
质量（克）13.28块（15.55克）
直径（毫米）直径（31.65毫米）31.65（对面）
除了经济成本继续发行的银50澳分，显着的负面评论产生混乱的圆形的20澳分硬币。决定补发50澳分硬币不仅考虑改变不同形状的材料也帮助解决混乱的20澳分。一个新的形状和合金是重新进入流通九月1969。
标称规格
19661969-present
作文80%银20%铜组成75%铜镍25%
形状圆形十二角
边磨边平原
质量（克）13.28块（15.55克）
直径（毫米）直径（31.65毫米）31.65（对面）
| Reverse Design | Year and design details | Production
RAM = Royal Australian Mint RMLL= Royal Mint, Llantrisant |
 |
1966 Commonwealth Coat of Arms sculpted by Stuart Devlin |
36.5 million, RAM |
| No 50 cents were produced in 1967 or
1968 |
||
 |
1969 Commonwealth Coat of Arms sculpted by Stuart Devlin |
14 million, RAM |
 |
1970 Commemorating the bicentenary of James Cook's 1770 voyage. Based on a painting by John Webber. The inclusion of Cook's signature was thought to be the first use of a facsimile signature on a coin. Designed by Stuart Devlin. |
16.5 million, RAM |
|
1971-1976 Commonwealth Coat of Arms sculpted by Stuart Devlin |
1971: 21.1 million, RAM 1972: 5.6 million, RAM 1973: 4 million, RAM 1974: 9 million, RAM 1975: 19.1 million, RAM 1976: 27.3 million, RAM |
 |
1977 Commemorating the 25th anniversary of the Accession of Queen Elizabeth II. Based on a central wattle blossom symbol of Australia surrounded by 25 overlapping crowns. Designed by Stuart Devlin. |
1977: 25 million, RAM |
|
1978-1981 Commonwealth Coat of Arms sculpted by Stuart Devlin |
1978: 25.8 million, RAM 1979: 24.9 million, RAM 1980: 38.7 million, RAM 1981: 24.1 million, RAM |
 |
1981 Commemorating the marriage of HRH the Prince of Wales and Lady Diana Spencer. Designed by Stuart Devlin. |
1981: 20 million, RMLL |
 |
1982 Commemorating the Brisbane XII Commonwealth Games. Incorporates the Games symbol designed by Hugh Edwards to reflect the form of a kangaroo in full flight. Designed by Stuart Devlin. |
1982: 49.6 million, RAM |