Zenith 420

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Calibre 420 is a hand-wound chronograph movement from Zenith. Released in the 1990's, this was the first hand-wound version of the classic El Primero movement.


As the El Primero renaissance continued in the 1990's, Zenith modified the movement to remove the innovative automatic winding mechanism. The resulting Cal. 420 is in other ways similar to the contemporary Cal. 400, with a three-register chronograph counter setup and quickset date.

See Also


Hand-winding movement
Escapement: Stone lever
Column wheel calibre


Chronograph: 60 seconds, 30 minutes, 12 hours
Small seconds
Quickset date at 4:30


13¼ lignes
D 30.0 mm, H 5.7 mm
25 jewels
36,000 A/h
Power reserve 55 hours

Production period: