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Perth Mint · Australia
Silver Koala 1 oz
1 troy oz — 99.99% Silversilvercurrent
Annual silver bullion coin featuring Australia's iconic koala. New design each year, introduced by the Perth Mint in 2007.
Physical Specifications
| Mass | 31.107 g |
| Troy Ounces | 1 oz |
| Diameter | 40.6 mm |
| Thickness | 2.98 mm |
| Edge | reeded |
| Purity | 99.99% Silver |
| Fineness | 0.9999 |
| Density | 10.5 g/cm³ |
| Face Value | 1 AUD |
| Series | Australian Koala |
| First Minted | 2007 |
Authentication Reference
Use these values to verify an authentic Silver Koala 1 oz. All tests can be performed with a digital scale, callipers, and the EON ping tester.
Weight
31.107grams
Use a 0.001 g digital scale. Calibrate first with a known object (a €2 coin = 8.50g).
Dimensions
Diameter40.6mm
Thickness2.98mm
Use plastic callipers (not steel — avoid scratching). Or use the camera tool with a bank card as reference (ISO 7810: 85.60mm × 53.98mm).