| Issuer | Australia |
|---|---|
| Year | 1991 |
| Type | Non-circulating coin |
| Value | 20 Cents |
| Currency | Dollar (1966-date) |
| Composition | Silver (.925) |
| Weight | 13.09 g |
| Diameter | 28.65 mm |
| Thickness | 2.5 mm |
| Shape | Round |
| Technique | Milled |
| Orientation | Medal alignment ↑↑ |
| Engraver(s) | |
| In circulation to | |
| Reference(s) | KM#82a |
| Obverse description | 3rd portrait of Queen Elizabeth II facing right wearing the King George IV State Diadem. |
|---|---|
| Obverse script | Latin |
| Obverse lettering | ELIZABETH II AUSTRALIA 1991 RDM |
| Reverse description | Platypus in water, value superimposed. |
| Reverse script | Latin |
| Reverse lettering | 20 SD |
| Edge | Reeded |
| Mint | |
| Mintage | 1991 - Proof in Masterpieces in Silver Set - 25 000 |
| Numisquare ID | 1790144940 |
| Comments |