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The Omega 8500 Movement Stop Pinion (7228500A32105) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement. As part of the automatic winding system, the stop pinion works with the wig-wag pinions and oscillating weight to enable smooth bi‑directional winding. It is a recognized service part 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 – works with wig-wag pinions in the bi‑directional winding system
Precision-engineered – manufactured to Omega’s factory specifications
Service replacement part – recognized in official Omega technical documentation
Part Number: 7228500A32105
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 stop pinions
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 7228500A32105), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list as “Stop pinion” for Caliber 8500A.
2. Which movement versions is this component compatible with?
This stop pinion 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 stop pinion?
The stop pinion is part of the automatic winding system that works in conjunction with the wig‑wag pinions to control the bi‑directional winding function, allowing the mainspring to be wound regardless of the rotor’s direction of rotation.
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