iwc portuguese chronograph classic reference 3904 Operating Instructions Manual page 10

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R E A D I N G T H E C H R O N O G R A P H
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 12-hour and a 60-minute 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.
U S I N G T H E C H R O N O G R A P H
Start: To start the chronograph, press the start/stop button.
Flyback: You can start recording a new time immediately, even when the chrono-
graph is running. Simply depress the reset/flyback 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 button is released.
Stop: To stop the running chronograph, press the start/stop button.
Reset: Depress the reset/flyback button fully, as far as it will go. This will reset all
the chronograph hands to zero.
Aggregate time recording: You can add stop times together by pressing the start/
stop button again after the first measurement, instead of the reset/flyback button.
P O R T U G U E S E C H R O N O G R A P H C L A S S I C