Rolex 4030

Rolex 4030 is a calibre by Rolex.

This self-winding chronograph movement bases on the calibre El Primero by Zenith (Calibre Zenith 400) and has been modified by Rolex.

The fast-oscillating Zenith calibre has been clocked down from 36,000 A/h to 28,800 A/h and has been provided with a Breguet hairspring and with microstella screws.

It was used in the model Rolex Oyster Perpetual Cosmograph Daytona till 2000. Afterwards it was replaced by the Rolex-own development Rolex 4130.

Manufacturer: Rolex Description: Self-winding movement, bi-directional winding Breguet hairspring Chronometer certificate (COSC) Escapement: Stone lever Yoke winding system Glucydur balance wheel with microstella screws Kif shock protection for balance wheel and escape wheel Functions: Chronograph Small seconds Data: 13¾ lignes D 31.0 mm, H 6.55 mm 31 jewels 28,800 A/h Power reserve 50h Production period: 1989-2000