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The Omega 8500 Movement Intermediate Wheel For Additional Hour Wheel (7228500A35079) is a genuine Swiss-made component for the Omega Caliber 8500 Co-Axial automatic movement. This intermediate wheel is a key part of the motion work, forming part of the geartrain that supports the “additional hour wheel” and enabling the independent hour‑adjustment function that allows the hour hand to be moved in one‑hour increments without stopping the movement . It is a listed service part for Caliber 8500A version and is typically replaced during servicing when wear or irregular hour‑setting behavior is detected .
Genuine Omega part – authentic Swiss‑made component for Caliber 8500A
Motion work component – forms part of the gear train supporting the additional hour wheel
Independent hour‑adjustment system – enables the Hour Vision quick‑set hour function
Precision-engineered – manufactured to Omega’s factory specifications
Direct replacement – designed for professional servicing and restoration
Part Number: 7228500A35079
Compatible Movement: Omega Caliber 8500A
Movement Diameter: 29.00 mm (12¾”’)
Movement Height: 5.5 mm
Jewels: 39
Frequency: 25,200 vph (3.5 Hz)
Power Reserve: 60 hours (two series-coupled barrels)
Origin: Switzerland (Omega factory part)
Condition: Brand new
Service and overhaul of Omega Caliber 8500A movements
Motion work repair – replacing worn or damaged intermediate wheels
Hour‑adjustment system restoration – restoring smooth independent hour‑setting function
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 7228500A35079). It is listed in the official Omega spare parts list under the component name “Intermediate wheel for additional hour wheel” and is identified as a part for Caliber 8500A . It is not an aftermarket or generic component.
2. Which movement versions is this component compatible with?
According to Omega technical documentation, this specific reference 7228500A35079 is listed for Caliber 8500A. For Caliber 8500B, the reference changes to 7228500B35079 . Please verify your movement version before ordering. The Caliber 8500 is used in models such as the De Ville Hour Vision and Seamaster Aqua Terra .
3. What is the function of the intermediate wheel for additional hour wheel?
In the Caliber 8500’s motion work, this intermediate wheel forms part of the gear train that drives the hour wheel . It is a critical component for the movement’s independent hour‑adjustment system (often referred to as the “Hour Vision” function), which allows the hour hand to be advanced or retarded in one‑hour jumps without stopping the balance or affecting the minute hand .
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