Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin comparison
Franklin Half Dollar vs Kennedy Half Dollar (1964)
Identical ring: how these two silver coins differ on the scale, under the calipers, and — computed from first-principles physics — in the ring.
Official specifications, side by side
| Franklin Half Dollar | Kennedy Half Dollar (1964) | |
|---|---|---|
| Weight | 12.5 g | 12.5 g |
| Diameter | 30.6 mm | 30.6 mm |
| Composition | .900 silver (90%) | .900 silver (90%) |
| Mint | United States Mint | United States Mint |
Expected ring, mode by mode
| Mode | Franklin Half Dollar | Kennedy Half Dollar (1964) |
|---|---|---|
| c0d2 | 4.33–5.42 kHz | 4.33–5.42 kHz |
| c0d3 | 10.06–12.46 kHz | 10.06–12.46 kHz |
| c0d4 | 17.57–21.77 kHz | 17.57–21.77 kHz |
The Franklin Half Dollar and Kennedy Half Dollar (1964) share the same mass, diameter, and metal, so the physics gives them the same resonance reference — the ping test cannot tell a genuine one from the other, and doesn't need to. It tells either apart from a wrong-metal fake. Frequencies are computed from each coin's published mass, diameter, and metal via free circular-plate physics — see the methodology.
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