iwc IW3931, Operating Instructions Manual

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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
Reset:
Depress the reset/flyback
push­button fully,
as far as it will
go
. This will reset all the chronograph
hands to zero.
Aggregate timing: You can add stop
times together by pressing the start/
stop push­button again after the first
measurement instead of the reset/
flyback push­button.