How to identify a fake Jaeger-LeCoultre Duometre
A fake Jaeger-LeCoultre Duometre has one main flaw: the movement. The real Duometre uses two independent gear trains. One train drives the time. One train drives the complication. A fake usually has one gear train. The dial layout then looks wrong.
What the real Duometre does
Jaeger-LeCoultre launched the Duometre in 2007. The name comes from "duo" and "metre." The watch has two barrels. Two gear trains share one escapement. The left crown winds the time train. The right crown winds the complication train. Each train has its own power reserve. The Duometre a Chronographe has a seconds hand that jumps in one-sixth of a second increments. The dial has two subdials for the two power reserves.
Common fake flaws
- One crown controls both functions. Real Duometre has two crowns.
- Power reserve indicators show equal values. Real indicators move independently.
- The jumping seconds hand sweeps. Real hand ticks six times per second.
- Subdial positions are mirrored. Real layout places time on left, complication on right.
- Case thickness is under 12 mm. Real Duometre cases measure 14 mm or more.
Verification steps
- Set the time. Wind the left crown. The right crown must not move.
- Activate the chronograph. The seconds hand should jump. A smooth sweep is a fake.
- Check the power reserve indicators. Wind one crown. Only one indicator should rise.
- Look at the case back. Real Duometre movements have a dual-wing bridge. Fakes use a single bridge.
- Measure the case. Real Duometre a Chronographe is 42 mm wide and 14.5 mm thick.
No public database lists every fake. A watchmaker with a Duometre reference can compare the movement. Serial numbers on the case back and movement must match. Jaeger-LeCoultre does not publish a serial lookup. Absence of proof is not proof of a fake.