Zenith 405

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Calibre 405 (and updated 405B) is an automatic flyback chronograph movement from Zenith. Released in the 1990's, this was one of the first modifications to the classic El Primero movement.


As the El Primero renaissance continued in the 1990's, Zenith made the first major complication addition with the introduction of the flyback-equipped Cal. 405.

Because of the unconventional 4:30 date window placement in the classic El Primero movement, Zenith created a new calibre, Cal. 405B, which moved the date to the 6:00 position.

See Also


Self-winding movement, bi-directional central rotor winding
Escapement: Stone lever
Yoke winding system
Column wheel calibre
331 components


Flyback chronograph: 60 seconds, 30 minutes, 12 hours
Small seconds
Quickset date at 4:30 or 6:00


13¼ lignes
D 30.0 mm, H 6.5 mm
31 jewels
36,000 A/h
Power reserve 50 hours

Production period: