Short answer
A replica Cartier automatic watch uses a self-winding mechanical movement inside a case and dial that copy a genuine Cartier design. On the wrist, a weighted rotor swings, winds the mainspring, and powers the hands with no battery. The movement, not the logo, decides whether the watch is worth owning. Almost every replica Cartier automatic sold today uses one of three movements: a clone of the ETA 2824-2, a Miyota 9015, or a Chinese automatic from the Seagull ST21 family. All three run at 28,800 vibrations per hour, so the seconds hand sweeps in eight small steps per second.
Confirm the real model is automatic
Cartier builds quartz and automatic versions of the same line. The Tank Must small is quartz; the large and extra-large Tank Must run automatic. Santos, Ballon Bleu from 33 mm, Pasha, Drive, and Ronde Must automatic models use self-winding calibres. Before you order a replica, check the genuine specification sheet. If the authentic version is quartz, a replica with a spinning rotor is the wrong build.
Inspection steps
- Ask the seller for the exact movement name and beat rate in writing. "Swiss movement" alone is not an answer.
- Turn the watch over and flick your wrist. The rotor should spin with little resistance and reverse when you change direction. A rotor that sticks or grinds points to a dry or damaged bearing.
- Wind the crown by hand through 30 to 40 turns. The action should feel smooth with light resistance. Grit or a sudden slip means the winding train is rough.
- Set the time, then leave the watch dial up for a full day. A 2824 clone should reach about 38 hours and a Miyota 9015 about 42 hours on a full wind.
- Record the accuracy over 24 hours against a reference clock. Plus or minus 20 seconds per day is typical for a clone. Anything past 40 seconds needs regulation or a return.
- Film the seconds hand with a phone at 60 frames per second and count the steps. Eight steps per second is correct for 28,800 vph. Four steps means a 21,600 vph movement.
- Check the crown cabochon. Cartier uses a blue spinel on steel models. A plastic bead or a flat glass dome is a giveaway.
- Inspect the bracelet screws and the caseback screws for matching heads and clean slots.
- Skip water resistance claims. Unless a pressure test was done, keep the watch away from showers, pools, and salt water.
Movement choices
ETA 2824-2 and clones
The 2824-2 is a 25-jewel automatic with a 38 to 40 hour power reserve and a date function. Clones from Asia copy the layout, so parts and servicing are available at most independent watchmakers. Expect a noisy rotor and a rough hand-wind feel on the cheapest copies.
Miyota 9015
The 9015 is a Japanese automatic made by Citizen. It is thin at 3.9 mm, runs at 28,800 vph, and holds about 42 hours. It is more consistent out of the box than a low-grade clone, and it fits slim Cartier cases such as the Tank and the Santos Dumont.
Seagull ST21 series
Seagull builds its own automatic on the same architecture. Quality varies by grade. The better versions keep time well; the cheapest ones arrive dry and run fast.
About "Swiss Made" on a replica
The Swiss Made label has a legal definition tied to where a movement is made, assembled, and inspected. A counterfeit dial stamped with those words carries no such guarantee. Treat the stamp as decoration and judge the movement by how it runs.
Care and service
Have an automatic replica serviced every four to six years. A service costs more than many replicas cost to buy, so decide before you spend. Store the watch on a winder only if you wear it less than once a week. Keep it away from strong magnets such as laptop speakers and tablets.