Gold Azadi specifications and ping frequencies
The Gold Azadi is a gold coin from Iran (1991–Present), weighing 8.13 g with a diameter of 22 mm. Tapped gently on its edge, a genuine one rings at about 5.2 kHz, 11.7 kHz and 20.3 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 | 5199 Hz · 11725 Hz · 20300 Hz |
|---|---|
| Metal | Gold |
| Composition | 90% gold, 10% copper |
| Weight | 8.13 g |
| Fine metal content | 7.317 g |
| Diameter | 22 mm |
| Thickness | 1.52 mm |
| Country | Iran |
| Years | 1991 - Present |
Compare with the ping frequencies of every supported coin.
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