iwc PILOT'S WATCH PERPETUAL CALENDAR CHRONOGRAPH Operating Instructions Manual page 26

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USING THE CHRONOGR APH
Start: To start the chronograph, press the start/stop push-button.
Flyback: You can start recording a new time immediately, even when the chronograph is running.
Simply depress the reset/flyback push-button fully, as far as it will go. All three chronograph hands
are reset to zero, and a new measurement is started as soon as the push-button is released.
Stop: To stop the running chronograph, press the start/stop push-button.
Reset: Depress the reset/flyback push-button fully, as far as it will go. This will reset all the chrono-
graph hands to zero.
Aggregate timing: You can add recorded times together by pressing the start/stop push-button again
after the first measurement instead of the reset/flyback push-button.
PILOT'S WATCH PERPETUAL CALENDAR CHRONOGR APH