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This is a genuine Omega Caliber 1861 hour recording runner mounted, an original movement component with part number 72203211788. As a critical part of the chronograph mechanism, this wheel assembly ensures proper hour counter functionality in the manual-winding Caliber 1861 movement.
This brand new original part is essential for watchmakers restoring correct chronograph function when the original component becomes worn or damaged .
Genuine Omega Part – Swiss factory-original, perfect fit for Caliber 1861.
Chronograph Hour Core – Transfers power from the minute counter wheel to the hour counter wheel for 12‑hour accumulation.
Precision Assembly – Accurately machined teeth and pivots for stable, precise hour counter movement.
Essential for Service – Replace when the hour counter fails to advance, sticks, or jumps incorrectly.
Compatible Movement – Designed for Omega Caliber 1861 (and variants 1863, 1866) manual‑wind chronograph.
| Parameter | Details |
|---|---|
| Part Name | Hour Recording Runner Mounted |
| Part Number | Omega 72203211788 |
| Compatible Movements | Omega Caliber 1861, 1863, 1866 (manual‑wind chronograph) |
| Function | Drives the chronograph hour counter |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Omega Caliber 1861 (e.g., Speedmaster Professional “Moonwatch” 3570.50)
Omega Caliber 1863 (sapphire sandwich, e.g., 311.30.42.30.01.005)
Omega Caliber 1866 (moonphase, e.g., 3576.50)
Repair of chronograph hour counter that does not advance, accumulates incorrectly, or sticks
Replacement of worn or damaged hour recording runners during movement service
1. Is this a genuine Omega part?
Yes. It is a Swiss Omega factory-original part (72203211788) for Caliber 1861/1863/1866, not a copy.
2. What are the symptoms of a damaged hour recording runner?
Symptoms: the hour counter does not move when the chronograph is started; the hour hand jumps irregularly or gets stuck between marks; the minute counter works but the hour counter does not.
3. What should I pay attention to during installation?
This component sits in the chronograph module, engaging with the minute counter wheel and hour wheel. Clean the train, align gears, and ensure pivots drop into jewels. Follow the Omega technical guide. Professional installation is strongly recommended.
4. Does this part fit all 1861 variants (1861, 1863, 1866)?
Yes. The chronograph train is identical across these calibers – fully compatible.
5. Is lubrication required after replacement?
Yes. Apply a tiny amount of dedicated chronograph lubricant to the gear teeth and pivots as specified in the Omega technical guide.
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