Coin Pinger
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Silver coin guide
Silver Britannia 1/4 oz — ping test & specs
The quarter-ounce Silver Britannia (2023+) is a 22 mm .999 bullion coin. Small silver rings very high — a single readable mode, at the edge of phone-mic reliability.
Opens the free tester with this coin preselected — audio never leaves your device.
Official specifications
| Weight | 7.776 g |
| Diameter | 22 mm |
| Composition | .999 fine silver |
Source: The Royal Mint. Coin Pinger checks measured weight and diameter against these values.
Expected resonance range
High confidence*| Mode | Expected ring | Recommended variance |
|---|---|---|
| c0d2 | 10.19–11.60 kHz | ±6.5% |
A genuine Silver Britannia 1/4 oz rings within these ranges at its c0d2 vibration modes, fixed by its size and metal. The recommended variance is how far a genuine specimen's ring can sit from each center — built up in quadrature from real manufacturing tolerance and temperature (under 1%), phone-mic capture reproducibility (≈4%), an extra allowance on the fundamental for minting-asymmetry splitting, and a per-metal model-uncertainty term (largest for .9999 gold, whose modulus is least certain). The higher modes also carry a small thick-plate centre correction, since a real coin is not infinitely thin. The high-confidence tag reflects how well-established this metal's constants are: Computed from well-established silver elastic constants and cross-checked against same-size sibling coins. These are guidance bands, not exact values — see the methodology for the exact formula, or calibrate your own coin in the app for a specimen-exact reference and tighten each peak per coin.
Small-coin note: at 22 mm this coin is below the ≥25 mm sweet spot — its ring is higher-pitched, shorter, and quieter than a full-size coin's, and only its fundamental mode stays under the 20 kHz phone-mic ceiling. Tap close to the microphone in a quiet room, expect more retries, and lean harder on the weight and diameter checks.
* These are computed guidance ranges. Certain your Silver Britannia 1/4 oz is genuine but it won't match? Send us its ring — we'll dig in and improve the reference.
🎙 Submit sample pingsHow to ping test a Silver Britannia 1/4 oz
- Hold — grip the coin by its center (a nodal point) in a coin ping-test holder so the rim rings freely; a fingertip at the center is a last resort.
- Tap — strike the edge with a striker near the microphone.
- Read the verdict — MATCH or NO MATCH against the peaks above, plus weight and size checks.
Silver Britannia 1/4 oz — frequently asked
How much does a Silver Britannia 1/4 oz weigh?
The official specification is 7.776 g in .999 fine silver (source: The Royal Mint). Coin Pinger's weight check allows ±0.3 g by default.
What size is a Silver Britannia 1/4 oz?
22 mm in diameter, per The Royal Mint. Note the average disc thickness is less than the rim caliper reading — the raised rim and relief concentrate metal at the edge.
What frequency does a genuine Silver Britannia 1/4 oz ring at?
Its fundamental (c0d2) vibration mode is computed to ring in the 10.19–11.60 kHz range. These are first-principles physics computations from the coin's published mass, diameter, and metal — not measurements of sample coins.
Why does my genuine Silver Britannia 1/4 oz ring slightly off the listed frequencies?
Phone-mic capture moves a genuine peak a few percent tap-to-tap — strike point, holding pressure, and the microphone's own response all matter. Temperature and normal minting tolerance add under 1%. The published band already allows for all of this; for a tighter reference, calibrate your own genuine Silver Britannia 1/4 oz in the app.
Does ping testing damage a Silver Britannia 1/4 oz?
No — the test needs only a light tap on the edge with a non-marring striker (a wooden pencil or plastic stylus works well), far gentler than normal handling. Hold the coin at its center so the rim can ring freely.