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Rolex 1555
Last updated: July 26, 2025
Brand
Caliber Number
1555
Production Period
1959-1965
Lignes
12.5
Diameter
28.50mm
Height
7.05mm
Power Reserve
Unconfirmed
Frequency
18,000 vph (2.5 Hz)
Jewels
25
Escapement
Swiss Lever
Anti-Shock Device
KIF
Hand Count
3
Manufacture Region
Unconfirmed
Functions
Hours, Minutes, Central Seconds, Day, Date
Rolex 1555 Description
The Rolex Caliber 1555 was the foundational automatic movement for the original Day-Date models. This COSC-certified chronometer introduced the line’s signature day and date complication. Operating at 18,000 vph, it was prized for its reliability and served as the technical base for the Day-Date’s rise to prominence. It was later succeeded by the higher-beat Caliber 1556.
Watches Using The Rolex 1555 Caliber
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