IWC Schaffhausen PILOT'S WATCH MARK XVIII Mode D'emploi page 29

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Please observe the following recommendation: Generally
the size of your wrist will increase during the course of the day,
depending on temperature and physical exertion. Before you
remove individual bracelet links, depending on the time of day
you should have the fine-adjustment system on the clasp closed
(in the morning) or open (in the evening).
P I L O T ' S W A T C H M A R K X V I I I