Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin comparison
Morgan Dollar vs Peace Dollar
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
| Morgan Dollar | Peace Dollar | |
|---|---|---|
| Weight | 26.73 g | 26.73 g |
| Diameter | 38.1 mm | 38.1 mm |
| Composition | .900 silver (90%) | .900 silver (90%) |
| Mint | United States Mint | United States Mint |
Expected ring, mode by mode
| Mode | Morgan Dollar | Peace Dollar |
|---|---|---|
| c0d2 | 3.86–4.82 kHz | 3.86–4.82 kHz |
| c0d3 | 8.93–11.07 kHz | 8.93–11.07 kHz |
| c0d4 | 15.56–19.29 kHz | 15.56–19.29 kHz |
The Morgan Dollar and Peace Dollar 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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