500 Lire specifications and ping frequencies
The 500 Lire is a silver coin from Italy (1958–2001), weighing 11 g with a diameter of 29 mm. Tapped gently on its edge, a genuine one rings at about 5.4 kHz, 12.5 kHz and 21.5 kHz: its first resonance frequencies, set by its metal, size and thickness. A counterfeit made of a different metal, or with a different weight or thickness, rings at different frequencies, which is what the ping test above checks.
| Ping test reference frequencies | 5437 Hz · 12466 Hz · 21453 Hz |
|---|---|
| Metal | Silver |
| Composition | 83.5% silver, 16.5% copper |
| Weight | 11 g |
| Fine metal content | 9.185 g |
| Diameter | 29 mm |
| Thickness | 2 mm |
| Face value | 500 Lire |
| Country | Italy |
| Years | 1958 - 2001 |
Compare with the ping frequencies of every supported coin.
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