Zenith EL PRIMERO 21 9004 Mode D'emploi page 14

4 > SETTING THE TIME
Position 0: winding position
In this position you can manually wind your chronograph
movement and watch by turning the crown. Pull the crown out
a notch to change to position (1).
Position 1: correcting the time
To correct the time, turn the crown in the required direction.
Do not forget to return the crown to position (0).
(0) (1)