Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin comparison
Mercury Dime (1916–1945) vs Roosevelt Dime (1946–1964)
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
| Mercury Dime (1916–1945) | Roosevelt Dime (1946–1964) | |
|---|---|---|
| Weight | 2.5 g | 2.5 g |
| Diameter | 17.91 mm | 17.91 mm |
| Composition | .900 silver (90%) | .900 silver (90%) |
| Mint | United States Mint | United States Mint |
Expected ring, mode by mode
| Mode | Mercury Dime (1916–1945) | Roosevelt Dime (1946–1964) |
|---|---|---|
| c0d2 | 7.39–9.23 kHz | 7.39–9.23 kHz |
| c0d3 | 17.14–21.24 kHz | 17.14–21.24 kHz |
The Mercury Dime (1916–1945) and Roosevelt Dime (1946–1964) 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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