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".

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