====== 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 [[high-beat|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]].


<WRAP ud ud_mov>

**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 [[ligne]]s
  * D 31.0 mm, H 6.55 mm
  * 31 [[jewels]]
  * 28,800 A/h
  * Power reserve 50h

**Production period:**
  * [[1989]]-[[2000]]
</WRAP>

{{tag>Movements Automatic_movements Chronograph_movements Rolex_calibres Automatic_chronograph_movements}}