Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin comparison
Silver Britannia 1 oz vs Silver Krugerrand 1 oz
Overlapping rings: 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
| Silver Britannia 1 oz | Silver Krugerrand 1 oz | |
|---|---|---|
| Weight | 31.21 g | 31.107 g |
| Diameter | 38.61 mm | 38.7 mm |
| Composition | .999 fine silver (2013+) | .999 fine silver |
| Mint | The Royal Mint | Rand Refinery / South African Mint |
Expected ring, mode by mode
| Mode | Silver Britannia 1 oz | Silver Krugerrand 1 oz |
|---|---|---|
| c0d2 | 4.31–4.91 kHz | 4.26–4.85 kHz |
| c0d3 | 10.00–11.21 kHz | 9.88–11.07 kHz |
| c0d4 | 17.37–19.47 kHz | 17.16–19.24 kHz |
Their fundamental bands overlap (4.31–4.91 vs 4.26–4.85 kHz), so a single ping may not separate a Silver Britannia 1 oz from a Silver Krugerrand 1 oz — combine the ring with the weight and diameter checks, which differ. Frequencies are computed from each coin's published mass, diameter, and metal via free circular-plate physics — see the methodology.
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