20 Pesos specifications and ping frequencies
The 20 Pesos is a gold coin from Mexico (1917–1959), weighing 16.666 g with a diameter of 27.5 mm. Tapped gently on its edge, a genuine one is expected to ring at about 4.8 kHz, 11.1 kHz and 19.2 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 | 4776 Hz · 11053 Hz · 19234 Hz |
|---|---|
| Metal | Gold |
| Composition | 90% gold, 10% copper |
| Weight | 16.666 g |
| Fine metal content | 14.999 g |
| Diameter | 27.5 mm |
| Thickness | 1.8 mm |
| Face value | 20 Pesos |
| Country | Mexico |
| Years | 1917 - 1959 |
These reference frequencies are predicted by our resonance model from the coin’s weight, size and metal, and not yet confirmed with recordings. Compare with the ping frequencies of every supported coin.
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