Quick answer
A fake 1815 398.032 fails on four points: movement finishing, hand engraving, case markings, and paperwork. Check those four before you judge the dial, because a counterfeiter can copy a photograph but not a hand-finished movement.
Prerequisites
- A 10x loupe
- A bright, directional lamp
- Lange's published specification for ref. 398.032: case size, metal, dial layout, calibre number
- High-resolution photos of a verified genuine example for side-by-side reference
- Photos of the caseback, movement, and papers if you cannot handle the watch in person
Step-by-step authentication check
Pull the official specification. Confirm the case diameter, metal, dial layout, and calibre against Lange's own reference data or an authorized dealer. If the watch does not match on paper, stop there.
Turn the watch over and study the movement through the caseback. Genuine Lange finishing is applied by hand: wide Glashütte ribbing on the three-quarter plate, circular graining on the wheels, and a matte frost on the steel parts. Copies use machine stripes with hard edges and mirror-polished plates that read nothing like the real surface.
Study the balance cock engraving with the loupe. A Lange engraver cuts the floral pattern freehand, so the scrolls vary in depth and curve in ways a machine cannot repeat. Fakes are stamped or laser-etched, which leaves shallow grooves, identical scrolls, and burrs along the edges.
Inspect the chatons and screws. Real gold chatons sit in a recess and are held by two or three blued screws; the screw heads are chamfered and the slots are polished. Fakes paint the screws blue, leave the slots raw, and press imitation chatons in place or omit them.
Check the ratchet wheel and crown wheel. Lange finishes these with a sunburst pattern, while copies leave them flat or brushed in one direction. Look for tool marks, fingerprints under the sapphire, and dust on the movement, none of which belong on a watch that left Glashütte.
Read every engraving on the case. The caseback should carry the reference number, the case serial, the metal hallmark, and "Made in Germany". The lettering must be deep and crisp. Fakes use shallow engraving, wrong fonts, and stamps that skip the hallmark altogether.
Compare the number between the lugs with the number on the movement. Both should appear in the certificate. Mismatched or scratched-out numbers point to a counterfeit or a rebuilt watch.
Examine the dial and hands under the loupe. Genuine printing has clean edges, while fakes show ink bleed, double outlines, and uneven letter spacing. Hands should be blued steel or rhodium with polished bevels and flat surfaces. Painted hands with lumps of lacquer are a clear sign of a copy.
Wind and set the watch. A hand-wound Lange winds with even resistance and no grit. The crown should turn without wobble and click into each position against a firm stop. A loose crown, grinding, or a stem that pulls out too far points to a cheap base movement.
Verify the papers and the seller. Ask for the certificate, the service history, and the name of the dealer who sold it. Contact an A. Lange & Söhne service center to confirm the serial. If a seller refuses an inspection or a written guarantee, walk away.
Check the price. A genuine 1815 does not sell at a fraction of its market value. A price that looks impossible means the watch is fake, stolen, or damaged beyond the asking price.
Red flags that end the inspection
- Movement number that does not match the papers
- Missing "Made in Germany" marking or an incorrect hallmark
- Stamped or laser-etched engraving on the balance cock
- Painted screws or imitation chatons
- A seller who blocks a watchmaker's inspection
If you already bought a fake
Stop wearing the watch and document everything: photos, the listing, the payment record, and all messages with the seller. Report the sale to the platform and, in the US, to the FTC and your state attorney general. Then get a written opinion from a watchmaker who services Lange so you can attach it to a dispute or a chargeback.