Mühle Glashütte Teutonia IV BlueMoon Bedienungsanleitung Seite 26

The water resistance of your watch
The water resistance of your watch has been inspected according to German
DIN standard 8310 at the overpressure indicated on the case back. Prior to
use in water, check whether the crown is in Position 0 , i.e. screwed into the
winding stem of the case until hand-tight! Only then is the water resistance of
the watch preserved.
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Attention! The water resistance ratings apply to brand-new watches. Over
time, the water resistance of a particular watch may become impaired due
to shocks and knocks, in case of chemical reactions due to petrol, adhesive,
paint, cleaning spray etc., as well as frequent turning of the crown (abrasion).
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