A fake A. Lange & Söhne gold watch tends to fail on the same three points: the case is not solid 18k gold, the movement was not finished by hand, and the numbers do not match Lange's own production records. Lange makes a few thousand watches a year, so counterfeiters cut corners where they think nobody looks. That is exactly where you should look first.
Check the case before anything else
Solid 18k gold has a density near 15.5 g/cm³. Stainless steel sits around 7.9. Put a gold Lange 1 in one hand and a steel watch of similar size in the other and the difference is immediate. A plated or gold-filled fake feels like what it is, and it is often a millimeter or two thicker because the case was never designed around a real Lange movement.
Then read the metal. Lange stamps its gold cases with the fineness mark and German assay marks, and the stamping is crisp and centered. Fakes often carry laser-etched marks that look shallow, or a "750" sitting on top of the plating instead of in it. Wear tells the story too: plating thins on the lugs, the crown, and the caseback edge, and a different color shows through.
One shortcut worth knowing. Honey gold is Lange's own 18k alloy, harder than standard rose or yellow gold and made nowhere else. If a watch is described as honey gold and it did not come from Lange, the description is wrong by definition.
The caseback is where fakes give up
Turn the watch over and the argument ends fast.
- Balance cock engraving. Every Lange balance cock is engraved by hand with a floral scroll. Two watches of the same reference never carry identical engraving. Fakes are laser-etched or stamped, so the lines look shallow, and every copy from the same batch carries the same pattern.
- The three-quarter plate. Lange uses untreated German silver, a copper-nickel-zinc alloy with a warm gray tone. Fakes use rhodium-plated brass that reads bright white and mirror-like under a lamp.
- Chatons and screws. Lange sets jewels in gold chatons held by blued steel screws. Fakes use plain brass settings and painted blue screws that show chipped color inside the slot.
- Engraved numbers. The movement number is engraved on the plate and should match the case number and the paperwork.
Dial, hands, and the outsize date
Lange's outsize date is the detail most people miss. The two discs sit in a frame with even gaps, sharp numerals, and the correct typeface. Copies show uneven spacing, fuzzy printing, a date that flips at the wrong moment, or a frame sitting proud of the dial. On the dial itself, look at the printing under magnification. Lange's text is pad-printed and clean at the edges. Fakes bleed.
Hands matter too. Some Lange references use heat-blued steel, others solid gold. Fakes use chrome-plated steel with a flat, cold tone that never shifts in light the way blued steel does.
Numbers, papers, and price
- Ask for the movement number and the case number, and check that both match the papers.
- Send those numbers to an authorized Lange service center. Lange keeps archives and can confirm what left Glashütte.
- Have a jeweler run an XRF test. It is non-destructive and reports the actual alloy in the case.
- Compare the asking price to the market. A gold Lange 1 starts around $40,000 new and stays in five figures used. A "solid gold Lange" at $2,000 is neither solid nor gold.
Before you hand over money
Buy from an authorized dealer or a seller with documented provenance and a return window. Ask for a service invoice, not just a box. If the seller cannot produce numbers, refuses an authentication, or pushes you to move fast, stop. The watch is not going anywhere, and neither is your money.