Short answer
A replica Rotonde de Cartier Astrotourbillon copies the round 47 mm case, the Roman numeral dial, and the arm that carries the balance wheel. Most replicas do not reproduce the orbit. They use a standard tourbillon cage at 6 o'clock, or a fixed arm that never moves. A moving carriage appears in a small number of builds and costs more.
What the original does
Cartier released the Rotonde de Cartier Astrotourbillon in 2010. The movement is caliber 9451 MC, manual wind, built at Cartier in La Chaux-de-Fonds, Switzerland. The case measures 47 mm across. Cartier sold it in platinum and in rose gold.
The carriage is the difference. A standard tourbillon spins in place inside a cage. The Astrotourbillon carriage rotates around the center of the dial. One full orbit takes 60 seconds. The balance wheel and escapement sit at the tip of the arm. Cartier holds patents on the layout. A 2015 Skeleton version used caliber 9465 MC in a 45 mm case.
What replicas copy
Replica makers copy the outside first: case profile, lugs, crown with a blue cabochon, sapphire crystal, dial print, and strap. The 47 mm size is easy to match because the case is a plain round shape.
Inside, most replicas use a Chinese tourbillon movement. Sea-Gull and Hangzhou make tourbillon movements that appear in replica watches. These run at 21,600 vibrations per hour, or 3 Hz, and hold 40 to 48 hours of reserve. The cage spins at 6 o'clock. That reads as a tourbillon to a casual eye. It is not an orbit.
What replicas miss
- The orbit. An arm that travels around the dial needs a different gear train, a heavier carriage, and a balance that stays in beat while it moves. Few replica calibers do this. Some add a metal arm that does not move.
- Dial work. Cartier stamps and guilloche the dial in steps. Replica print shows thicker lines and flatter texture.
- Finishing. Geneva stripes, chamfered bridges, and polished screw heads on the 9451 MC are hand-finished. Replica plates are machine-finished.
- Mass. A platinum 47 mm case weighs more than a steel replica. Reps use steel or a plated alloy.
How to check one
- Time the arm with a stopwatch. It must return to the same point at 60 seconds. Watch for a stall at the top of the dial.
- Look at the balance. On the original, the balance sits at the arm tip. If the balance sits in the middle of a cage, the build is a standard tourbillon.
- Measure the case. 47 mm is the original number. Many replicas come in at 42 mm to 44 mm.
- Run a timegrapher. Check rate in six positions. A rep tourbillon inside 10 seconds a day is a good unit.
- Check the caseback text. Caliber 9451 MC, jewel count, and the Cartier script should match photos of the original.
- Wind it by hand. 20 to 25 turns should feel clean.
Price and supply
Replica tourbillons sell from about $400 to $1,500. Builds with a moving arm sit at the top of that range. Prices move with movement supply and shipping. Ask for a video with a timer in frame. The video shows the arm at work and the running seconds.
US legal status
Counterfeit watches are illegal to import into the United States. US Customs and Border Protection can seize shipments under 19 U.S.C. 1526. Most sellers do not replace a seized parcel.