Zenith 4001

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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".

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 lignes
D 30.0 mm, H 7.55 mm
31 jewels
36,000 A/h
Power reserve > 50h

Production period:

Since 2002