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Gold coin guide
Austrian 100 Corona — ping test & specs
The Austrian 100 Corona is a .900 gold restrike dated 1915, sold at bullion value with 30.49 g of fine gold. Its copper alloy and 37 mm size give it a lower ring than pure-gold coins.
Opens the free tester with this coin preselected — audio never leaves your device.
Official specifications
| Weight | 33.875 g |
| Diameter | 37 mm |
| Thickness | 2.3 mm |
| Composition | .900 gold (90%) |
Source: Austrian Mint (restrike). Coin Pinger checks measured weight and diameter against these values.
Expected resonance range
Good confidence*| Mode | Expected ring | Recommended variance |
|---|---|---|
| c0d2 | 2.52–3.17 kHz | ±11.5% |
| c0d3 | 5.85–7.30 kHz | ±11.1% |
| c0d4 | 10.24–12.79 kHz | ±11.1% |
A genuine Austrian 100 Corona rings within these ranges at its c0d2/c0d3/c0d4 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). This coin's band is widened further because circulated 90%-silver classics lose mass and edge crispness with wear, spreading their ring. The higher modes also carry a small thick-plate centre correction, since a real coin is not infinitely thin. The good-confidence tag reflects how well-established this metal's constants are: Computed from 22k-gold alloy constants, which are slightly less certain than silver; the band is set accordingly. 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 Austrian 100 Corona 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 Austrian 100 Corona
- 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.
Austrian 100 Corona — frequently asked
How much does a Austrian 100 Corona weigh?
The official specification is 33.875 g in .900 gold (90%) (source: Austrian Mint (restrike)). Coin Pinger's weight check allows ±0.3 g by default. Circulated specimens lose a little mass to wear, so weigh toward the low side of that window.
What size is a Austrian 100 Corona?
37 mm in diameter and 2.3 mm thick at the rim, per Austrian Mint (restrike). 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 Austrian 100 Corona ring at?
Its fundamental (c0d2) vibration mode is computed to ring in the 2.52–3.17 kHz range, with higher modes near 5.85–7.30 kHz and 10.24–12.79 kHz. These are first-principles physics computations from the coin's published mass, diameter, and metal — not measurements of sample coins.
Why does my genuine Austrian 100 Corona ring slightly off the listed frequencies?
Wear is the biggest factor for the Austrian 100 Corona: circulated 90%-silver classics lose mass and edge crispness, which spreads the ring across specimens. On top of that, phone-mic capture moves a genuine peak a few percent tap-to-tap (strike point, how you hold it, the mic itself). That's why this reference band is wider than a modern bullion coin's.
Does ping testing damage a Austrian 100 Corona?
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.