iwc IW3931 Operating Instructions Manual page 21

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NOTE
If your watch has a strap made of
leather, textile or rubber with a leather
or textile inlay, make sure that the
high­quality strap does not come into
contact with water, oily substances,
solvents, cleaning agents or cosmetic
products. This way you can prevent
discoloration and premature ageing of
the material.
D A V I N C I T O U R B I L L O N R É T R O G R A D E C H R O N O G R A P H