iwc Mark XVII Mode D'emploi page 27

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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 re-
move 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