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20 Cents - Elizabeth II 4th Portrait - Hyper-Metallic Platypus
| Issuer | Royal Australian Mint |
|---|---|
| Year | 2013 |
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| Engraver(s) | Ian Rank-Broadley |
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| Obverse description | Fourth crowned effigy of Queen Elizabeth II facing right, wearing the Girls of Great Britain and Ireland Tiara, as sculpted by Ian Rank-Broadley. The truncated portrait is rendered in high relief against a plain field. The legend ELIZABETH II AUSTRALIA 2013 arcs around the upper periphery, with the designer's initials IRB appearing below the portrait truncation. |
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| Obverse script | Latin |
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| Additional information |
The "Hyper Metallic" finish was a Royal Australian Mint technology introduced in the early 2010s that applied a multi-layered electrochemical coloring process to standard copper-nickel blanks, producing iridescent surface tones without the use of paint or ink. The process was aimed squarely at the collector market during a period when the RAM was aggressively expanding its annual program of circulation-quality variants — same dies, altered blank treatment, premium price point.
KM#403c distinguishes this piece from the standard circulation strike (403) and the preceding portrait variants by finish alone, not by die design.