IWC Schaffhausen 3716 Mode D'emploi page 23

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Watches with a soft­iron inner case provide a higher level of pro-
tection against magnetic fields and far exceed the requirements
of DIN standard 8309. Nevertheless, it is still possible for the
watch movement to become magnetized in close proximity to
very strong magnets. We therefore recommend that watches with
a soft­iron inner case also be kept away from direct contact with
strong magnets.
Should there be a sudden change in the precision of your time-
piece, please contact an authorized IWC Official Agent to have
your watch checked for magnetism.
W A T E R - R E S I S T A N C E
The water­resistance of IWC watches is stated in bar and not
in metres. Metres, which are often used elsewhere in the watch
industry to indicate water­resistance, cannot be equated with dive
depth because of the test procedures that are frequently used.
Water­resistance shown in metres provides no indication as to
actual use of the watch in the presence of moisture and wetness,
and in or under water. Recommendations for use in connection
with the water­resistance of your watch can be found on the Inter­
net at www.iwc.com/water­resistance. Your authorized IWC Of-
ficial Agent will also be pleased to provide you with information.
P O R T U G I E S E R C H R O N O G R A P H