iwc IW3931 Operating Instructions Manual page 8

— 8 —
scale. Your watch is shockproof and
water­resistant 3 bar. The engraved
rotor made of 18­carat red gold winds
the watch in both directions of rotation
via IWC's double­pawl winding. Your
watch is equipped with a flying minute
tourbillon, a unique micro­mechanism
that minimizes the effect of gravity
on the accuracy. The tourbillon, an
invention made in the aftermath of the
French Revolution, has always been
regarded as the ultimate challenge
in the quest for absolute mech anical
watchmaking precision. More specific­
ally, the purpose of the mechanism is
to counterbalance the one­sided pull
of the earth's gravity on the balance.
D A V I N C I T O U R B I L L O N R É T R O G R A D E C H R O N O G R A P H