Authenticate your 1 oz Gold Austrian Philharmonic

How to spot a fake 1 oz Gold Philharmonic

The Vienna Philharmonic (Wiener Philharmoniker), struck by the Austrian Mint since 1989, is one of the most popular gold bullion coins in Europe. Its design barely changes from year to year apart from the date, and it has a plain edge, so it has fewer built-in features to check than some other coins. That makes measurements, a close look and a ping test all the more useful, used together.

What fakes exist

• Gold-plated base metal. Brass, copper or zinc alloy with a gold coating. Usually wrong in weight or size, with a colour that's off. The most common kind and the easiest to catch.
• Cast fakes. Made from a mould of a real coin; soft detail and a grainy surface.
• Gold-plated tungsten. Tungsten is almost as dense as gold, so a tungsten core with a gold shell can come close to the correct weight and size. These are the fakes that a scale and calipers can miss.

The checks, in order of usefulness

1. Weight

Weigh the coin on a scale that reads to 0.01 g and compare it with the facts box. A plated base-metal fake is usually clearly light or heavy. A correct weight doesn't prove the coin is genuine, because a tungsten fake can get close, but a wrong weight is a strong reason to stop.

2. Diameter and thickness

Measure with digital calipers. The Gold Philharmonic is unusually wide and thin for a 1 oz gold coin: noticeably wider and thinner than a Maple Leaf, Krugerrand or Gold Eagle. That shape helps you. A fake made from a lighter metal has to be thicker to reach the right weight, and on a coin this thin the extra thickness is easy to measure. Check at several points on the rim.

The Silver and Platinum Philharmonics share the same diameter but have a different thickness, so make sure you are comparing with the gold figures.

3. Edge

The genuine edge is plain (smooth), with no reeding. A reeded Philharmonic is wrong. Because there is no reeding to hide behind, look at the edge closely with a 10x loupe while turning the coin slowly:

• no seam or join line running around the edge
• the same colour and finish as the faces
• an even, well-defined rim on both sides
• no flat spots when you roll it

A seam or a change in colour on the edge can be a sign of a shell over a different core.

4. Design and colour

Obverse (Musikverein organ): the organ pipes should be individually defined, including the small ones. "REPUBLIK ÖSTERREICH" should be evenly spaced, with the umlaut on the Ö. Check "1 UNZE GOLD 999.9" and the face value: "100 EURO", or "2000 SCHILLING" on coins struck before the euro (up to 2001).

Reverse (instruments): the cello, violins, harp, bassoon and Vienna horn should have sharp detail, with strings and f-holes visible under a loupe rather than blurred together. "WIENER PHILHARMONIKER" and the year should be clean and evenly spaced.

Colour: .9999 gold is a rich, bright yellow, noticeably more yellow than 22-carat coins such as the Krugerrand or Gold Eagle. An orange, reddish or pale tint, or uneven colour (especially at the rim, where plating wears first), is a warning sign.

Cast fakes often show a grainy, sandy surface and soft lettering under magnification.

5. Magnet

Gold isn't magnetic. If a strong neodymium magnet attracts the coin, it is fake. This only catches fakes with iron or steel in them: tungsten, copper and brass aren't attracted either, so passing this test proves little.

6. Ping test

Balanced on a fingertip and tapped gently, a genuine Gold Philharmonic rings with a clear tone set by its size, shape and metal. A base-metal or tungsten-core fake usually sounds different. Use the ping test at the top of this page to compare the coin's ring with the frequencies expected for a genuine Gold Philharmonic.

Because the coin is so thin and wide, its lowest resonance can be harder to bring out than on thicker coins. If that peak doesn't show up, try tapping again a little differently before drawing conclusions; a missing low peak on its own isn't a sign of a fake.

The ping test is one strong check among several, not a final verdict. Background noise, how the coin is held, damage, or testing in a capsule can affect the result, and some fakes could pass. If it disagrees with your other tests, test further.

7. Conductivity, specific gravity and XRF

• Electrical conductivity testers (such as the Sigma Metalytics) read beneath the surface and can tell gold from tungsten.
• Specific gravity: weigh the coin in air and then suspended in water. Plated base metal fails clearly; tungsten is close to gold, so this is less useful against tungsten fakes.
• XRF, which many dealers have, measures surface composition. A thick plating can fool it, so combine it with a conductivity or density test.

Date and variety notes

• 1989–2001: face value in Austrian schillings (2000 SCHILLING on the 1 oz).
• 2002 onwards: face value in euros (100 EURO on the 1 oz). The design and specifications are otherwise the same.
• The design is essentially unchanged across years, so a fake die can be reused for many dates. Don't take a convincing design as proof on its own.

If you suspect a fake

1. Stop. Don't spend more on it, sell it or trade it on.
2. Repeat the tests and add the ones you haven't done: weight, calipers, edge under a loupe, ping test, and ideally a conductivity test.
3. Take it to a reputable dealer or assay office for a professional check.
4. If it is fake, contact the seller and the platform you bought through, keep the records, and report it where appropriate. Don't put it back into circulation.

Buying from established dealers with a return policy is the simplest protection. A price well below what other dealers charge is a warning sign.

For the silver version, see the Silver Philharmonic guide.