Most watches sold as vintage A. Lange & Söhne are neither vintage nor Lange. The Dresden works were expropriated in 1948 and the name sat dormant until 1994, so genuine vintage pieces are either pre-war pocket watches or early modern Lange 1 models. Both are uncommon, documented, and costly. Fakes fill the gap, and they usually fail in the same four places.
The short answer
A fake comes apart under four checks: movement architecture, case hallmarks, dial printing, and the serial number trail. Run them in order and stop at the first failure. A seller who resists any single check is moving replica stock.
Authentication checklist
- Ask for a clear macro photo of the movement before you discuss price.
- Compare the plate layout against a reference photo of the same caliber.
- Read the caseback hallmarks with a 10x loupe or a phone macro lens.
- Photograph the dial under raking light to catch repainted or laser-printed text.
- Request the serial number and cross-check it against the reference and the paperwork.
- Price the watch against recent auction results for that exact reference.
What the movement should show
Every post-1994 Lange carries a hand-engraved balance cock, a three-quarter plate with Glashütte ribbing, and heat-blued screws set in gold chatons. Fakes use a stock ETA or a Chinese clone hidden under a decorative plate. The engraving is machine-cut and shallow, the ribbing runs flat in one direction, and the screws are painted rather than blued. On genuine pre-war pocket watches the finishing is older but still hand-done, with sharp anglage on the bridges instead of rounded, buffed edges.
Case and hallmarks
Gold Lange cases carry crisp hallmarks struck into the metal, not laser-etched and not stamped over a polished surface. Re-engraved cases show soft edges around the hallmark, and the serial number sits too deep or too shallow. Check the caseback for tool marks and for a serial that does not match the movement number.
Dial and hands
Original dials have even, slightly raised printing and correct font weight for the reference. Repainted dials look flat or glossy, or the subdial sits off-center. Blued steel hands show a deep, uniform color with a slight sheen. Painted blue hands flake at the edges and read purple under direct light.
Paperwork and serial numbers
Ask for the archive extract from the manufacture, the original invoice, and service records. Serial numbers should match across the case, the movement, and the papers. A missing extract is not proof of a fake on its own, but a seller with no paper trail at all for a five-figure watch is a seller to leave alone.
When to walk away
Walk away if the seller refuses movement photos, if the hallmarks are shallow, if the dial font is wrong, if the serial does not match, or if the price sits far below auction results. Any one of those is enough.