20 Francs Vreneli specifications and ping frequencies
The 20 Francs Vreneli is a gold coin from Switzerland (1848-date) (1897–1949), weighing 6.45 g with a diameter of 21 mm. Tapped gently on its edge, a genuine one rings at about 5.5 kHz, 12.6 kHz and 22.2 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 | 5481 Hz · 12648 Hz · 22185 Hz |
|---|---|
| Metal | Gold |
| Composition | 90% gold, 10% copper |
| Weight | 6.45 g |
| Fine metal content | 5.805 g |
| Diameter | 21 mm |
| Thickness | 1.25 mm |
| Face value | 20 Francs |
| Country | Switzerland (1848-date) |
| Years | 1897 - 1949 |
Compare with the ping frequencies of every supported coin.
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