iwc Aquatimer Automatic Operating Instructions Manual page 11

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Important: Although the watch is water­resistant 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
The dial, the hands, as well as the markings on the internal ro­
tating bezel of your watch have luminescent elements that allow
you to read the time effortlessly even in total darkness. The two
luminescent elements at 12 o'clock serve as a reference point.
A Q U A T I M E R A U T O M A T I C