Short answer
A fake A. Lange & Söhne gold watch is a copy of a Glashütte-made watch with a case the seller calls gold. Most copies sold as "gold" carry a plated case over brass or 316L steel. Solid 18k copies exist, but they are rare and cost far more. No copy uses a Lange movement. Every one uses a clone caliber or a modified third-party movement.
How to Spot a Phony Lange Gold Watch: Buyer's Guide
Gold content
Real Lange gold cases are solid 18k. That alloy is 75 percent gold by weight. Density runs about 15.5 g/cm³ for 18k yellow gold and 15.9 g/cm³ for 18k rose gold. Steel is 7.9 g/cm³. Brass is 8.5 g/cm³.
Plated cases
Plating runs 1 to 5 microns. A micron of gold adds almost no weight. A Lange 1 case in solid gold weighs about 45 grams. The same case shape in plated steel weighs about 25 grams.
Gold-filled cases
Gold-filled cases bond a sheet of 10k or 14k gold to a base metal. Thickness runs 50 to 100 microns. Few copy makers use this method. It costs more than plating, and the tooling is not common in the copy supply chain.
Weight as a test
Weight is the fastest check. A solid gold Lange 1 head sits between 40 and 50 grams. A plated copy sits near 25 to 30 grams. The gap shows up in the hand before any tool does.
Movement
Lange builds its calibers in Glashütte, Saxony. The L121.1 in the Lange 1 has 368 parts and a 72-hour power reserve. Copy movements come from Seagull, Hangzhou and similar factories. Most run 21,600 vph and hold 38 to 42 hours. Lange hand-engraves the balance cock with a burin. Copies show stamped or laser-etched flowers with uniform depth.
Price ranges
A Lange 1 in gold lists near $45,000 at retail. Copy prices fall into three bands. Plated steel runs $200 to $500. Plated cases with a decorated movement run $500 to $1,200. Solid 18k copies run $3,000 to $10,000 when they appear at all. No published index tracks these numbers, so quotes differ by seller.
Checks
- Weigh the watch head on a scale. Below 30 grams rules out solid gold.
- Read the caseback stamp. Lange uses one punch shape. Copies show shallow laser marks.
- Inspect the balance cock engraving under 10x. Hand cuts vary in depth. Laser cuts do not.
- Run X-ray fluorescence. XRF reads the surface alloy only. It reports plating, not the core metal.
- Check the case metal at the lug holes. Plating wears thin at contact points.
US law
19 U.S.C. § 1526 bars import of goods that copy a recorded trademark. CBP seizes those shipments. The Trademark Counterfeiting Act, 18 U.S.C. § 2320, sets criminal penalties for trafficking. Personal use is not an exception.
Open points
Sellers do not publish plating thickness or alloy content. Copy case makers do not release metal specs. Weight and finish are the only tests a buyer can run without lab gear.