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This is a genuine Omega hour counting wheel for Caliber 1861 chronograph movement, part number 72203211788, Swiss‑made. Located in the chronograph module, this wheel transmits power from the minute counter wheel to the hour counter wheel, enabling up to 12 hours of hour accumulation. It is also compatible with Caliber 1863 and Lemania 1873, 1874 manual‑wind chronograph movements, making it an ideal replacement part for repairing a non‑functioning or sticky hour counter.
Genuine Omega Part – Swiss factory‑original for Caliber 1861 and platform calibers.
Chronograph Hour Core – Drives the hour counter hand for up to 12 hours of timing.
Precision Machined – Accurately cut teeth for stable, precise hour counter movement.
Multi‑Caliber Compatibility – Fits 1861, 1863, Lemania 1873, 1874, and others.
Essential for Service – Replace when the hour counter fails to advance, jumps incorrectly, or sticks.
| Parameter | Details |
|---|---|
| Part Name | Hour Counting Wheel |
| Part Number | Omega 72203211788 (confirm with actual product) |
| Compatible Movements | Omega Caliber 1861, 1863; Lemania 1873, 1874 (manual chronograph) |
| Function | Drives the 12‑hour chronograph 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).
Other chronographs using Lemania 1873, 1874 movements.
Repair of chronograph hour hand that does not advance, accumulates incorrectly, or sticks.
1. Is this a genuine Omega part?
Yes. It is a Swiss factory‑original part for 1861/1863 and Lemania 1873/1874 calibers, not a copy.
2. Which part number is correct, 72203211788 or 72203277188?
There is an inconsistency. The commonly correct part number is 72203211788. Confirm with the seller before ordering.
3. What are the symptoms of a damaged hour counting wheel?
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.
4. What should I pay attention to during installation?
This wheel 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.
5. Does it require lubrication 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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