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Rolex 4030
Last updated: July 27, 2025
Brand
Caliber Number
4030
Production Period
1988 – 2000
Lignes
13”’
Diameter
30.5 mm
Height
6.5 mm
Power Reserve
Unconfirmed
Frequency
28,800 A/h (4 Hz)
Jewels
31
Escapement
Swiss Lever
Anti-Shock Device
Kif Flector
Hand Count
6
Manufacture Region
Unconfirmed
Functions
Automatic, Column-Wheel Chronograph (12hr, 30min), Small Seconds
Rolex 4030 Description
The Rolex 4030 is the legendary automatic chronograph movement that powered the “Zenith” Daytona from 1988 to 2000. It is based on the Zenith El Primero 400 ebauche but was so heavily modified by Rolex (approx. 50% of parts changed) that it’s considered a unique Rolex caliber. Key changes include reducing the beat rate to 28,800 A/h, removing the date, and adding a Rolex balance with a Breguet overcoil.
