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This is a genuine Cartier Caliber 1904 ratchet wheel, an original Swiss‑made component for Cartier‘s in‑house 1904 MC automatic movement. The ratchet wheel is a critical part of the winding mechanism, mounted on the mainspring barrel arbor. When the crown is turned for manual winding, the ratchet wheel engages with the crown wheel to rotate the barrel arbor, winding the mainspring. This brand new original part is essential for watchmakers restoring proper winding function when the original wheel becomes worn or damaged.
Genuine Cartier Part – Swiss factory‑original for Caliber 1904 MC, not a copy.
Manual Winding Core – Mounted on the barrel arbor, engages with the crown wheel to transmit winding torque.
Precision Machined – Accurate teeth for smooth, durable winding.
Essential for Service – Replace when manual winding slips, spins freely, or fails.
Compatible Movement – Designed for Cartier Caliber 1904 MC automatic.
| Parameter | Details |
|---|---|
| Part Name | Ratchet Wheel |
| Compatible Movement | Cartier Caliber 1904 MC automatic (including variants 1904‑PS, 1904‑CH MC, etc.) |
| Type | Genuine original |
| Function | Transmits crown torque to the barrel arbor during manual winding |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Cartier Caliber 1904 MC automatic movement (found in Ballon Bleu, Tank, Santos, etc., with in‑house automatic calibers).
Repair of manual winding failure, crown spinning without effect, or slipping.
Replacement of worn, broken, or damaged ratchet wheels during movement service.
1. Is this a genuine Cartier ratchet wheel?
Yes. It is a Swiss factory‑original part for Caliber 1904 MC, not a copy.
2. What are the symptoms of a damaged ratchet wheel?
Symptoms: the crown spins freely when winding (no resistance); cannot wind the mainspring; or a slipping sensation during winding. Automatic winding may still work.
3. What should I pay attention to during installation?
The ratchet wheel is secured to the barrel arbor by a central screw. Clean the threads and tighten to the recommended torque. Professional installation is strongly recommended.
4. Does this ratchet wheel fit all 1904 MC variants (e.g., 1904‑PS)?
Yes. The entire 1904 MC family (including 1904‑PS two‑hand and 1904‑CH MC chronograph) shares the same winding train; the ratchet wheel is common.
5. Does the crown wheel need to be replaced at the same time?
Not always. If the crown wheel teeth are also visibly worn, replace both. Inspect both components.
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