iwc IW3931 Operating Instructions Manual page 14

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READING THE
CHRONOGRAPH
Chronograph seconds hand: The
scale for the central chronograph
seconds hand runs around the edge
of the dial.
Minute and hour counters: The
subdial at 12 o'clock has two hands,
which run continuously and show
the elapsed time on a 12­hour and a
60­minute scale. The hour and minute
counters can be read like a standard
analogue time display. In other words,
one revolution of the minute counter is
equal to 60 minutes, and one revolution
of the hour counter is equal to 12 hours.
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