¼ Ounce Krugerrand specifications and ping frequencies
The ¼ Ounce Krugerrand is a gold coin from South Africa (1980–2026), weighing 8.48 g with a diameter of 22 mm. Tapped gently on its edge, a genuine one is expected to ring at about 5.9 kHz, 13.5 kHz and 23.3 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 | 5876 Hz · 13490 Hz · 23300 Hz |
|---|---|
| Metal | Gold |
| Composition | 91.67% gold, 8.33% copper |
| Weight | 8.48 g |
| Fine metal content | 7.774 g |
| Diameter | 22 mm |
| Thickness | 1.83 mm |
| Face value | ¼ Krugerrand |
| Country | South Africa |
| Years | 1980 - 2026 |
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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