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This is a genuine Audemars Piguet date indicator driving wheel for the Caliber 3120 and 3126 automatic movements, a Swiss‑made original component. As the core of the calendar module, it is driven by the hour wheel and transmits energy to the date disc at a frequency of 21,600 vph, ensuring a stable and accurate date change at midnight. This original factory part is an essential replacement for watchmakers to resolve calendar display issues when servicing Caliber 3120/3126 movements.
Genuine Audemars Piguet Part – Swiss factory‑original for Caliber 3120 and 3126, not a copy.
Calendar Drive Core – Driven by the hour wheel, completes one rotation every 24 hours to advance the date disc.
Instantaneous Date Jump – Works with a jump switch mechanism to ensure a crisp date change at midnight.
Precision Machined – Accurate gear teeth for smooth, jitter‑free torque transmission.
Cross‑Model Compatibility – Fits both the base Caliber 3120 and the chronograph Caliber 3126/3840 (Dubois‑Depraz module).
| Parameter | Details |
|---|---|
| Part Name | Date Indicator Driving Wheel |
| Compatible Movements | Audemars Piguet Caliber 3120, 3126/3840 automatic |
| Frequency | 21,600 vph (3 Hz) |
| Power Reserve | Approx. 60h (3120) / 50h (3126) |
| Jewels | 40 (3120) / 59 (3126/3840) |
| Components | 280 parts (3120) / 365 parts (3126) |
| Function | Drives the date disc for daily advancement |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Audemars Piguet Caliber 3120 automatic (found in Royal Oak 15300, 15400, 15450; Jules Audemars, etc.).
Audemars Piguet Caliber 3126/3840 automatic chronograph (found in Royal Oak Offshore Chronograph models).
Repair of calendar faults: date fails to advance, jumps halfway, changes at the wrong time, or jumps weakly.
Replacement of worn or damaged date driving wheels during movement service.
1. Is this a genuine Audemars Piguet date driving wheel?
Yes. It is a Swiss factory‑original part for Caliber 3120 and 3126, not a copy.
2. As a chronograph movement, does the 3126 share the same date mechanism as the 3120?
Yes. The 3126 is based on the 3120 and adds a Dubois‑Depraz chronograph module, but the calendar mechanism remains in the base movement layer and is identical to the 3120 – the date driving wheel is fully interchangeable.
3. How can I tell if the date driving wheel needs replacement?
Typical symptoms: the date does not change in the window; the date jumps halfway (stuck between two numbers); the date changes at the wrong time (not at midnight); or the jump feels weak / delayed.
4. What should I pay attention to during installation?
Clean the calendar works before installation. Ensure proper meshing between the hour wheel, date driving wheel, and date disc. Follow the Audemars Piguet technical guide. Professional installation is strongly recommended.
5. Does the date disc need to be replaced at the same time?
Not always. If the date disc’s internal teeth are also worn or the numerals are faded, replace both. Try replacing the driving wheel first; if issues persist, inspect the date disc.
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