Quick answer
The search term "replica duometre a sphere" targets copies of the Jaeger-LeCoultre Duomètre à Sphérotourbillon. The spelling in the query is wrong. No replica carries both features of the original: two gear trains in one movement and a tourbillon cage set at 30 degrees. Copies priced from US$ 300 to US$ 1,500 hold a single Chinese tourbillon movement, and a tilted cage is the main visual claim. US law bars import and sale of these watches.
The original watch
Jaeger-LeCoultre released the Duomètre à Sphérotourbillon in 2012. Calibre 382 runs two barrels and two gear trains. Train one keeps time. Train two drives the tourbillon and its zero-setting seconds. A crown at 2 o'clock resets those seconds to zero for a clean start. The balance sits at 30 degrees to the movement plane. That angle changes the effect of gravity as the cage turns. The case measures about 42 mm and came in 18k rose gold and platinum. Retail prices sat in the six-figure range.
What the copies contain
Assembly shops in Guangzhou and Shenzhen build these watches. Most use a Chinese tourbillon base from the Seagull or Hangzhou works. Real tourbillon copies rotate the cage once per minute, the same rate as the original. The 30-degree tilt is cosmetic on many units. The cage leans, but the balance and hairspring stay on one plane.
Price bands: US$ 300 to US$ 700 for plated steel, US$ 700 to US$ 1,500 for openworked dials and sapphire. Rose gold tone comes from PVD plating. The plating wears at the crown, lugs and caseback edges within 12 to 24 months of daily wear. Timekeeping runs from +20 to -40 seconds a day in buyer tests. Water resistance is not rated. Gasket quality is the weak point, and 30 m is the ceiling.
Case sizes run 42 to 44 mm. Weight sits below the gold original, since most cases are steel or plated brass.
Checks on any unit
- Second crown: it should reset the small seconds to zero. On copies it often does nothing or spins free.
- Cage rate: film the cage. One turn per minute matches a real tourbillon.
- Subdial alignment: hands should sit level at 6 and 12.
- Glass: sapphire marks a higher grade. Mineral glass scratches at Mohs 5 to 6.
- Caseback engraving: check depth and font, not flat laser print.
Legal status in the US
18 U.S.C. § 2320 covers trafficking in counterfeit goods. A first offense by an individual carries up to 10 years in prison and a fine up to US$ 2,000,000. Customs and Border Protection targets watches with protected marks at ports of entry and destroys seized goods. A purchase for personal wear is not the same charge as resale, but the import itself is unlawful and the watch can be taken. Resale, even one piece through a forum or social app, moves a case into trafficking territory.
Service and parts
Parts for these movements come from the same factories in Guangdong. A watchmaker in the US may decline service, since some parts carry protected marks. A service on a Chinese tourbillon costs US$ 150 to US$ 400 when a shop accepts the job. Replacement cases and dials ship from Chinese suppliers, not from Switzerland.