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The Omega 8500 Movement H2 Hour Wheel (7228500A3104602) is a genuine Swiss-made component for the Omega Caliber 8500 Co-Axial automatic movement. The H2 version features a 2.0mm height, which controls the hour hand height and transmission, ensuring correct hand stack alignment and smooth time display. This hour wheel is a known service item in the 8500 caliber, as it can wear over time and is a critical part of the movement’s Hour Vision independent hour‑adjustment system.
Genuine Omega part – authentic Swiss-made component for Caliber 8500
H2 version with 2.0mm height – ensures correct hand stack alignment and precise power transmission
Hour Vision independent hour‑adjustment – enables hour hand to be adjusted in one‑hour increments without stopping the movement
Precision‑engineered – manufactured to Omega’s factory specifications
Direct replacement – designed for professional servicing and restoration
Part Number: 7228500A3104602 (also listed as 31046** in manuals)
Height Version: H2 (2.0mm)
Compatible Movement: Omega Caliber 8500 (Co-Axial automatic)
Movement Diameter: 29.00 mm (12¾”’)
Movement Height: 5.5 mm
Jewels: 39
Frequency: 25,200 vph (3.5 Hz)
Power Reserve: 60 hours
Origin: Switzerland
Condition: Brand new
Service and overhaul of Omega Caliber 8500 movements
Hour hand transmission repair – replacing worn hour wheels that cause hour hand jumping failure or free play
Independent hour‑adjustment system restoration – restoring smooth one‑hour increment functionality
Restoration of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500-powered models
Suitable for professional watchmakers and authorized service centers
1. Is this a genuine Omega part?
Yes, this is a genuine Omega factory part (reference 7228500A3104602), manufactured in Switzerland. It is not an aftermarket or generic component.
2. Which movement is this hour wheel compatible with?
This H2 hour wheel is specifically designed for the Omega Caliber 8500 automatic movement. It is a critical part of the Hour Vision independent hour‑adjustment system.
3. What is the function of the hour wheel in the 8500 movement?
The hour wheel controls the hour hand height and transmission. In the 8500 movement’s Hour Vision system, it enables the hour hand to be adjusted independently in one‑hour increments without affecting the minute and second hands. Over time, this part can wear, causing hour jumping failure or free play.
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