Omega
Omega cal 8500
Co-Axial (Omega) · introduced 2007
Beat rate
25,200 vph
Power reserve
60h
Jewels
39
Introduced
2007
Escapement
Co-Axial (Omega)
The cal 8500 introduced the Co-Axial escapement to the Seamaster De Ville lineup, using a twin-barrel architecture for its 60-hour reserve and a silicon balance spring for magnetic resistance. It was Omega's first in-house COSC-certified Co-Axial automatic. The movement is visually distinguished by its bilateral rotor and Geneva waves on the bridges.
Specifications
Beats per hour
25,200
Jewels
39
Power reserve
60h
Diameter
30.5mm
Height
7.9mm
Escapement
Co-Axial (Omega)
Introduced
2007
Finishing
Fine
Service interval
8 years
Service cost tier
Luxury
Complications
date
Known service issues
- The co-axial escapement requires a Co-Axial-certified watchmaker for correct re-lubrication; standard lever-escapement oils will degrade it
- Silicon balance spring is not serviceable by independents without genuine Omega spares
- Some owners report higher than expected service frequency when the watch is worn regularly in dusty environments; the co-axial escapement tolerates contamination less gracefully than a standard lever
- The silicon escape wheel and lever require specialized tools not available at general watchmakers; budget for authorized service center pricing
Notable in
- Omega Seamaster Aqua Terra 150M 231.10.42.21.02.001
- Omega De Ville Prestige 424.13.40.21.02.001
- Omega Seamaster Planet Ocean 232.30.42.21.01.001
References in our catalog using this caliber
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: