Casa de Moneda de México · Mexico
The Azteca features the Aztec Sun Stone. Contains 15g of pure gold in a 90% alloy. Restrikes dated 1959 are widely available.
| Mass | 16.666 g |
| Troy Ounces | 0.4823 oz |
| Diameter | 27.5 mm |
| Thickness | 1.8 mm |
| Edge | lettered |
| Purity | 90% Au, 10% Cu |
| Fineness | 0.9 |
| Density | 17.2 g/cm³ |
| Face Value | 20 MXN |
| Series | Azteca |
| First Minted | 1917 |
| Ping Frequency | 4,778 Hz |
Use these values to verify an authentic Mexican 20 Pesos (Azteca). All tests can be performed with a digital scale, calipers, and the EON ping tester.
Use a 0.01g digital scale. Calibrate first with a known object (a €2 coin = 8.50g).
Use plastic calipers (not steel — avoid scratching). Or use the camera tool with a bank card as reference (ISO 7810: 85.60mm × 53.98mm).
Balance the coin on your fingertip and tap the edge with a pencil or plastic pen. Use the Ping Tester to analyse the ring.