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The Omega 8500 Movement Intermediate Winding Wheel (7228500A32037) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement. As part of the automatic winding system, this intermediate winding wheel transmits motion within the winding train, working alongside the reduction wheel, wig-wag pinions, and stop pinion to enable efficient bi‑directional winding . It is a recognized service part listed in the official Omega 8500 spare parts list for version 8500A .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500A
Automatic winding system component – transmits motion within the winding train
Enables bi‑directional winding – works with wig-wag pinions and stop pinion
Service replacement part – recognized in official Omega technical documentation
Precision-engineered – manufactured to Omega’s factory specifications
Part Number: 7228500A32037
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
Automatic winding system repair – replacing worn or damaged intermediate winding wheels
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 7228500A32037), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list under “Intermediate winding wheel”.
2. Which movement versions is this component compatible with?
This part is specifically listed for Omega Caliber 8500A in the technical documentation. For other versions (8500B, 8500G, and 8900), different references may be required. Please verify your movement version before ordering.
3. What is the function of the intermediate winding wheel?
The intermediate winding wheel is part of the automatic winding system that transmits motion within the winding train. In the Caliber 8500, it works with the reduction wheel, wig-wag pinions, and stop pinion to enable the bi‑directional automatic winding function that winds the mainspring regardless of the rotor’s direction of rotation.
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