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This is a genuine Omega date indicator driving wheel for Caliber 8605, part number 7228605A33020, Swiss‑made and brand new. As a key transmission component of the calendar mechanism, this gear transfers power from the movement‘s gear train to the date indicator disc, ensuring accurate and stable date advancement at midnight. It is intended for the service and repair of the Omega Caliber 8605 series Co‑Axial automatic movements.
Genuine Omega Part – Swiss factory‑original for Caliber 8605, not a copy.
Calendar Drive Core – Transfers power to the date disc for reliable date advancement.
Precision Machined – Accurate gear teeth for smooth, jam‑free date driving.
Essential for Service – Replace when the date fails to advance, jumps halfway, or advances at the wrong time.
Compatible Movement – Designed for Omega Caliber 8605 Co‑Axial automatic (and variants 8606, 8607, etc.).
| Parameter | Details |
|---|---|
| Part Name | Date Indicator Driving Wheel |
| Part Number | Omega 7228605A33020 |
| Compatible Movements | Omega Caliber 8605, 8606, 8607, and other 8600 series Co‑Axial automatic calibers |
| Function | Drives the date indicator disc |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Omega Caliber 8605 Co‑Axial automatic (found in Seamaster, Constellation collections with GMT or annual calendar).
Omega Caliber 8606, 8607, and other variants.
Repair of date display faults: no advance, half‑jump, or incorrect jump timing.
Replacement of worn or damaged date driving wheels during movement service.
1. Is this a genuine Omega date driving wheel?
Yes. It is a Swiss factory‑original part (7228605A33020) for Caliber 8605, not a copy.
2. What are the symptoms of a damaged date driving wheel?
Symptoms: date does not change in the window; date jumps halfway (stuck between two numbers); date changes at the wrong time (not at midnight); unusual noise during date jump.
3. What should I pay attention to during installation?
Clean the calendar works before installation. Ensure proper meshing with the date jumper and date disc. Follow the Omega technical guide. Professional installation is strongly recommended.
4. Does this part fit other Omega calibers like 8800?
No. The 8800 series has a different calendar construction – not interchangeable.
5. Is calibration required after replacement?
Yes. Test midnight advancement by advancing the time. Ensure the date jumps smoothly and synchronizes with the movement.
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