other
| Country | Australia | Denomination | 20 cents |
|---|---|---|---|
| Year | Mintmark | Royal Australian Mint (Canberra) | |
| Metal | copper-nickel | Purity | 0.0 |
| Weight g | 11.31 | Silver oz | |
| Gold oz | Premium | ||
| Notes | Reverse shows platypus; obverse features Queen Elizabeth II portrait; issued from 1966 onward. | ||