Casa de Moneda de México · Mexico
Quarter-ounce Gold Libertad. Part of the fractional series produced by the Mexican Mint since the Libertad program began in 1981.
| Mass | 7.7759 g |
| Troy Ounces | 0.25 oz |
| Diameter | 23 mm |
| Thickness | 1.4 mm |
| Edge | reeded |
| Purity | 99.9% Gold |
| Fineness | 0.999 |
| Density | 19.3 g/cm³ |
| Face Value | none |
| Series | Libertad |
| First Minted | 1981 |
| Ping Frequency | 3,300 Hz |
Use these values to verify an authentic Gold Libertad 1/4 oz. 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.