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Omega Caliber 8520 LAdies Automatic Watch Movement

Omega Caliber 8520

Brand Omega
Caliber Number 8520
In-House Yes
Movement Type Automatic
Jewels 28
Power Reserve 50 hours
Vibrations Per Hour 25,200bph
Hairspring Silicon Si14
Shock System Nivachoc
Features Co-Axial Escapement, date
Country of Manufacture Switzerland
Known Models 123.10.31.20.55.001

From the Omega website:

Self-winding movement with Co-Axial Escapement for greater precision, stability and durability. Free sprung-balance system with silicon balance-spring. Automatic winding in both directions to reduce winding time. Rhodium plated finish with exclusive Geneva waves in arabesque.

Omega Caliber 8520 LAdies Automatic Watch Movement

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Photo is from a ladies 31mm Constellation watch