Coin Pinger

Acoustic bullion authentication — free, private, on-device

Launch app

Silver coin guide

Silver Philharmonic 1 oz — ping test & specs

The Vienna Philharmonic is the Austrian Mint's 1 oz .999 silver bullion coin, Europe's best-selling silver coin. At 37 mm it is smaller and thicker than most 1 oz coins, giving higher ring frequencies.

🎙 Test this coin now

Opens the free tester with this coin preselected — audio never leaves your device.

Official specifications

Weight31.103 g
Diameter37 mm
Thickness3.2 mm
Composition.999 fine silver

Source: Austrian Mint. Coin Pinger checks measured weight and diameter against these values.

Expected resonance range

High confidence*
ModeExpected ringRecommended variance
c0d25.10–5.80 kHz±6.5%
c0d311.78–13.20 kHz±5.7%

A genuine Silver Philharmonic 1 oz rings within these ranges at its c0d2/c0d3 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.

* These are computed guidance ranges. Certain your Silver Philharmonic 1 oz is genuine but it won't match? Send us its ring — we'll dig in and improve the reference.

🎙 Submit sample pings

How to ping test a Silver Philharmonic 1 oz

  1. 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.
  2. Tap — strike the edge with a striker near the microphone.
  3. Read the verdict — MATCH or NO MATCH against the peaks above, plus weight and size checks.
🎙 Test this coin now

Related silver coins

Franklin Half Dollar Italy 500 Lire Morgan Dollar Peace Dollar Silver APMEX Round 1 oz Silver African Wildlife 1 oz
← Browse all coin guides
The physics of the Silver Philharmonic 1 oz ping

Those 2 peaks aren't random. When you strike the coin it flexes as a free disc in fixed patterns called vibration modes — 0 nodal circles with 2 and 3 nodal diameters, written c0d2 / c0d3. Each pattern rings at one frequency.

Where those frequencies land is set by the coin's geometry and metal. For a thin disc, frequency ∝ (thickness ÷ diameter²) × √(stiffness ÷ density). This Silver Philharmonic 1 oz is 37 mm across and about 3.2 mm thick in .999 fine silver, which puts its fundamental (c0d2) near 5450 Hz.

A perfect disc's modes sit near 1 : 2.3; this coin measures 1 : 2.29. That fixed spacing is the fingerprint of a genuine struck disc — Coin Pinger rejects taps that don't fit it (keys, glass, a coin lying on a hard surface).

And it's why a fake can't hide: change the metal and √(E/ρ) changes, so every mode moves. Struck in lead or a plated base metal instead, the ring would land far lower and die out with a dull, short thud — its c0d2 would land near ≈2400 Hz instead of 5450 Hz. Density can fool a scale; the ring can't be faked without the right metal.

We publish this as a High confidence reference. Computed from well-established silver elastic constants and cross-checked against same-size sibling coins.

Free-plate modes per A. W. Leissa, Vibration of Plates, NASA SP-160 (1969, public domain). See how we measure them →
Home · All coins · Algorithm · Methodology · Terms · Privacy