iwc Referenz 3878 Mode D'emploi page 24

Important: Although the watch is water-resistant in positions 0,
1 and 2, the crown should always be screwed in again for normal
use (position X).
r e a d i n g t h e t i M e i n t h e d a r k
Both the dial and the hour and minute hands of your watch have
luminescent elements that allow you to read the time effortless-
ly, even in total darkness. The distinctive triangle at 12 o'clock
serves as a reference point.
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 chrono-
graph 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.
e d i t i o n a n t o i n e d e S a i n t e x u p é r y
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p i l o t ' S W a t C h C h r o n o g r a p h