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Omega 503
Last updated: July 26, 2025

Brand
Caliber Number
503
Production Period
1955-1959
Lignes
12.5′′′
Diameter
27.9 mm
Height
6.55 mm
Power Reserve
Unconfirmed
Frequency
19,800 A/h (2.75 Hz)
Jewels
20
Escapement
Swiss Lever
Anti-Shock Device
Incabloc
Hand Count
4
Manufacture Region
Unconfirmed
Functions
Hours, Minutes, Central Seconds, Date, 24-Hour Indicator
Omega 503 Description
The Omega Caliber 503 is a historically important movement from the mid-1950s, as it was part of Omega’s first series of full-rotor automatic movements (the 50x family) that replaced the earlier “bumper” automatics. Introduced in 1955, this chronometer-grade caliber was technologically advanced for its time, featuring not only a date complication in a window but also a distinct 24-hour indicator sub-dial, which served as a day/night display. This combination of features was reserved for high-end models like the Globemaster, Seamaster Calendar, and early Constellations. The Caliber 503 represents a key transitional moment for Omega, combining the newfound efficiency of a 360-degree rotor with useful complications, paving the way for the legendary 55x/56x series that would follow.
Watches Using The Omega 503 Caliber
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