• Obverse: Portrait of Queen Elizabeth II facing right, legend “ELIZABETH II AUSTRALIA 2012.” Design by Ian Rank-Broadley (initials “IRB”).
• Reverse: Stylized platypus swimming through water; denomination “20” above. Designed by Stuart Devlin.
• Composition: 75% copper, 25% nickel
• Diameter: 28.65 mm; Weight: 11.30 g
• Edge: Milled (reeded)
• Mintage: 77,100,000
• Condition Notes: Light even wear on portrait and water lines; fields clean with faint toning; overall crisp AU appearance.
• Authenticity: Genuine Royal Australian Mint issue; no signs of alteration.