50 Pesos specifications and ping frequencies
The 50 Pesos is a gold coin from Mexico (1921–1947), weighing 41.67 g with a diameter of 37 mm. Tapped gently on its edge, a genuine one is expected to ring at about 3.7 kHz, 8.4 kHz and 14.7 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 | 3656 Hz · 8432 Hz · 14690 Hz |
|---|---|
| Metal | Gold |
| Composition | 90% gold, 10% copper |
| Weight | 41.67 g |
| Fine metal content | 37.503 g |
| Diameter | 37 mm |
| Thickness | 2.69 mm |
| Face value | 50 MXN |
| Country | Mexico |
| Mint | Casa de Moneda de México |
| Years | 1921 - 1947 |
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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