Michel Herbelin CAP CAMARAT GMT Mode D'emploi page 9

This watch enables you to permanently display the time in 2
time zones. It also enables you to temporarily display the time
in 24 time zones, as represented by the cities indicated on the
rotating bezel ring. Prior adjustment is necessary to display and
read the time in the 24 time zones.
ADJUSTING THE WATCH :
1. Local time adjustment
- Pull the crown out (5) to its maximum position
(Position 3).
- Adjust the local time (here 10:11).
Example :
You are in Metropolitan France, and the time
is 10:11.
The time is read normally using the 12H scale
markers.