Half Dollar Franklin specifications and ping frequencies
The Half Dollar Franklin is a silver coin from the United States (1948–1963), weighing 12.5 g with a diameter of 30.6 mm. Tapped gently on its edge, a genuine one rings at about 5.0 kHz, 11.4 kHz and 19.9 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 | 4980 Hz · 11422 Hz · 19911 Hz |
|---|---|
| Metal | Silver |
| Composition | 90% silver, 10% copper |
| Weight | 12.5 g |
| Fine metal content | 11.250 g |
| Diameter | 30.6 mm |
| Thickness | 2.15 mm |
| Face value | $0.50 USD |
| Country | United States |
| Years | 1948 - 1963 |
Compare with the ping frequencies of every supported coin.
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