iwc IW3921 Operating Instructions Manual page 28

— 2 8 —
Watches with a soft­iron inner case
provide a higher level of protection
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 recom­
mend 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 timepiece, please
contact an authorized IWC Official
Agent to have your watch checked
for magnetism.
D A V I N C I P E R P E T U A L C A L E N D A R C H R O N O G R A P H