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The Omega 8500 Movement Crown Wheel (7228500A31023) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement. As part of the manual winding mechanism, this crown wheel engages with the winding pinion to transmit rotational force from the crown to the mainspring barrel during manual winding . It is listed as a service part for Caliber 8500A in the official Omega spare parts list .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500A
Manual winding mechanism component – engages with winding pinion to transmit crown torque
Critical for manual winding function – enables the user to wind the mainspring via the crown
Service replacement part – recognized in official Omega technical documentation
Precision-engineered – manufactured to Omega’s factory specifications
Part Number: 7228500A31023
Compatible Movement: Omega Caliber 8500A
Movement Diameter: 29.00 mm
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
Manual winding repair – replacing worn or damaged crown 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 7228500A31023), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list for Caliber 8500A .
2. Which movement versions is this crown wheel compatible with?
This crown wheel is specifically listed for Omega Caliber 8500A in the technical documentation . For other versions, different references may be required. Please verify your movement version before ordering.
3. What is the function of the crown wheel in the manual winding mechanism?
The crown wheel is part of the manual winding mechanism that engages with the winding pinion . When the crown is turned, the crown wheel transmits rotational force through the winding pinion and reduction wheel to the mainspring barrel, enabling manual winding.
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