====== Zenith 4001 ======

The **Zenith 4001** is a calibre by [[Zenith]].

Further development of the [[self-winding]] movement [[Zenith 410]] (// El Primero //) with bi-directional winding ball bearing [[central rotor]] (Gold Inertia). With [[flyback]] function, day of the week, month and [[date display]] and [[moon phase]].

Used e.g. with the model [[Zenith Grande Chronomaster GT]] "El Primero".

<WRAP ud ud_mov>
**Description:**
  * [[Self-winding]] movement, bi-directional winding
  * [[Escapement]] Stone lever
  * [[Yoke winding system]]
  * [[Chronometer]] certificate ([[COSC]])
  * [[Column wheel]] calibre
  * [[Shock protection]] Kif-Ultraflex
  * 357 components

**Functions:**
  * [[Chronograph]]
  * [[Small seconds]]
  * [[Flyback]] function
  * Day of week indication Switch by a pusher at 7 30
  * [[Rapid calendar advance]]
  * Monat Switch by date
  * [[Moon phase]] Switch by pusher at 8 o'clock

**Data:**
  * 13¼ [[ligne]]s
  * D 30.0 mm, H 7.55 mm
  * 31 [[jewels]]
  * 36,000 A/h
  * Power reserve &gt; 50h

**Production period:**
  * Since [[2002]]
</WRAP>

{{tag>Movements Automatic_movements Chronograph_movements Flyback_chronograph_movements High-beat_movements Zenith_calibres Zenith_El_Primero_calibres}}