"Duomètre à Sphère" is a search term, not an official model name. Jaeger-LeCoultre sells the Duomètre Sphérotourbillon, launched in 2012. The name refers to the spherical tourbillon, a cage that turns on two axes and tilts away from the plane of the movement. A fake Duomètre à Sphère copies the case and the dial. The movement inside is never the Jaeger-LeCoultre caliber 382.
What the real watch does
Caliber 382 uses the Dual-Wing design. Two barrels sit in the movement. One barrel drives the going train and the time display. The second barrel drives the tourbillon carriage and the added functions. Two gear trains share one escapement. The case measures 42 mm. Jaeger-LeCoultre built the watch in rose gold and in platinum. Retail prices sat in the six-figure range in USD while the watch was current. Pre-owned prices move with condition, box, and papers.
What replicas copy and what they skip
Replica makers copy the case profile, the dial layout, the hands, and the engraving on the back. They skip the movement. Common builds use a Chinese automatic with a decorative plate and a tourbillon cage that turns with the seconds hand. Better builds fit a real one-minute tourbillon. No replica on the market runs a spherical tourbillon on two axes. No replica uses two independent barrels with separate gear trains.
Price bands
Copies with an automatic movement and a decorative bridge sell for about $200 to $600. Copies with a working one-minute tourbillon sell for about $900 to $2,500. The price reflects the tourbillon, not the accuracy to caliber 382. A seller who asks $5,000 for a "Swiss made Duomètre" describes a watch that does not exist.
Checks before you pay
- Ask for the caliber number. Caliber 382 appears on the movement and the caseback of the genuine watch.
- Ask for a 60-second video of the tourbillon. The cage should tilt as it turns.
- Ask how many barrels the movement has. Two barrels, two reserves.
- Ask for the reference number and compare it with the Jaeger-LeCoultre catalog entry.
- Ask for a photo of the watch on a scale. Steel cases weigh less than gold cases. A weight reading is not proof on its own.
Legal position in the United States
Counterfeit goods carry a counterfeit trademark. Import into the United States is illegal under 19 U.S.C. § 1526. U.S. Customs and Border Protection can seize shipments. Selling a copy as a genuine watch is fraud. Buying one for personal use carries less risk than reselling, but the item can still be seized.
Questions to ask a seller
- What movement is inside?
- Can you show the balance and the tourbillon in one video?
- What is the reference number on the caseback?
- Do you accept a return after a watchmaker opens the case?
If a listing uses "Duomètre à Sphère" alone, treat the phrase as a search term. Ask for the full string: Duomètre Sphérotourbillon, reference number, and caliber. Numbers are hard to fake for long.