Quick answer

A phony Lange gold watch fails three tests in most cases: the hallmark stamp, the heft of the case, and the movement finishing. Real A. Lange & Söhne gold cases carry a clean fineness stamp, a maker's mark, and crisp engraving on the back. The movement shows hand-engraved floral work on the balance cock, blued screws, and screwed gold chatons. Counterfeits blur the stamping, feel light for their size, and use printed or machined decoration.

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Prerequisites

  • A 10x jeweler's loupe
  • A digital scale that reads to 0.1 g
  • Reference photos of the exact model, such as Lange 1, Saxonia, or Datograph
  • A small magnet
  • The seller's box, papers, and service history, if any
  • Access to a jeweler with an XRF tester for a non-destructive gold reading

Step-by-step checks

  1. Ask the seller for the case number and the movement number before you meet, and write both down.
  2. Compare those numbers against the reference table for that model, since each caliber pairs with a known set of case styles.
  3. Weigh the watch head on the digital scale and compare the figure with the published weight or a documented example of the same reference.
  4. Run the loupe along the caseback engraving and confirm the letters are cut clean, sharp, and even in depth.
  5. Find the fineness stamp, look for 750 plus a maker's mark, and confirm the strike sits centered on flat metal.
  6. Hold the magnet near the case and note that gold shows no pull, though the buckle and internal steel parts will.
  7. View the movement through the display back and study the balance cock engraving under the loupe.
  8. Check the screws for polished heads, blued color, and slots with chamfered edges.
  9. Examine the dial printing and the outsize date on a Lange 1, where two separate discs should sit behind a bar.
  10. Send the numbers to A. Lange & Söhne service or an authorized dealer and request a record check before money changes hands.

What each failure means

Hallmark and case work

German gold carries a fineness stamp, and older pieces often add the crescent-and-crown hallmark. A soft, shallow, or doubled stamp points to a gold-plated case. Plating wears at the lugs and crown first, so look there for a different color under the surface. Ask a jeweler for an XRF reading when the stamp and the number do not agree.

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Weight and feel

Gold is dense, so an 18k case feels heavier than a steel case of the same size. A fake often uses brass or a plated base metal, and the head comes in well under the expected figure. Weigh it, then weigh a documented example of the same reference if you can. Do not lean on feel alone, since a thick strap can hide a light head.

Imitation Lange Gold Watches: How to Spot a Fake A. Lange & Söhne

Movement finishing

A. Lange & Söhne finishes movements to a standard that is hard to copy at a low price. Look for Glashütte ribbing on the three-quarter plate, screwed gold chatons, blued screws, and a hand-engraved balance cock with a floral pattern. Counterfeits use stamped or laser-etched decoration, and the engraving repeats the same design from watch to watch. On a real piece, no two balance cocks match.

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Dial and date

Printing on a real dial is crisp under a loupe, with no fringing or broken serifs. On a Lange 1, the outsize date uses two independent discs. A fake often prints the date, uses one disc, or sets the two numbers at different heights.

Paperwork

Boxes and papers are easy to fake, so treat them as supporting evidence and not proof. What matters is that the case number, the movement number, and the paperwork agree, and that the brand confirms the record. A seller who refuses a record check is the strongest signal you will get.

Where to verify

Contact A. Lange & Söhne service in Glashütte or a boutique, give the case and movement numbers, and ask for a history check. An authorized dealer can do the same. If the watch is already yours, a watchmaker with a Lange parts account can examine the movement and confirm the caliber. Report a counterfeit to U.S. Customs and Border Protection if it crossed a border, and keep the listing and messages for the record.