IWC Schaffhausen BIG PILOT'S WATCH PERPETUAL CALENDAR Mode D'emploi page 29

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POWER RESERVE DISPL AY
The power reserve display is divided into 7 days with continuous display. The winding mechanism
winds the watch continuously while you are wearing it, and you can follow the process on the power
reserve indicator. The marking in the area of the last day tells you that the power reserve is about to
expire. You should then wind the watch by hand, if necessary, since the precision can be reduced
in this area.
BIG PILOT'S WATCH PERPETUAL CALENDAR