US Mint · United States
Pre-1965 Washington Quarter struck in 90% silver.
| Mass | 6.25 g |
| Troy Ounces | 0.1808 oz |
| Diameter | 24.3 mm |
| Thickness | 1.75 mm |
| Edge | reeded |
| Purity | 90% Ag, 10% Cu |
| Fineness | 0.9 |
| Density | 10.3 g/cm³ |
| Face Value | 0.25 USD |
| Series | Washington Quarter |
| First Minted | 1932 |
| Ping Frequency | 6,370 Hz |
Use these values to verify an authentic Washington Quarter (90% Silver). 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.