Règle à calcul CIMIER - Francis WEB

CIMIER is a Swiss brand which has been making watches since 1925. The original watchmaker was R. Lapanouse.

In the sixties, they introduced watches with chronograph. One of them was a slide-rule watch, where the bezels act as a circular slide rule:


The watch is entirely mechanical, with a windup button on the right, and the 2 additional buttons are used to start and stop the seconds hand.
I realized that this could also be used as a marker when performing calculations on the slide rule.