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| 正面描述 | The fourth definitive effigy of Queen Elizabeth II, modelled by sculptor Ian Rank-Broadley, depicted in right-facing profile wearing the Girls of Great Britain and Ireland Tiara. The legend ELIZABETH II AUSTRALIA 30 DOLLARS encircles the portrait, with the engraver's initials IRB appearing below the truncation of the bust. |
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| 正面铭文 | 登录 以查看详情 |
| 背面描述 | 登录 以查看详情 |
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| 背面铭文 | 登录 以查看详情 |
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| 铸币厂 | 登录 以查看详情 |
| 铸造量 | 2015 P - BU - 37,669 2015 P - Proof - 227 |
| 附加信息 |
Australia's 1-kilogram silver Koala series has been issued annually by the Perth Mint since 2007, with the reverse design changed each year — a deliberate strategy to encourage collector repurchases rather than simple bullion accumulation. The 2015 issue falls under Ian Rank-Broadley's fourth portrait of Elizabeth II, which had been the Australian standard since 1999.
Perth Mint kilosilvers from this period were struck to .999 fineness rather than the .9999 standard the Mint applies to its gold issues — a pragmatic distinction driven by silver's greater susceptibility to surface spotting at ultra-high purities when exposed to atmospheric sulfur compounds during storage.