iwc PORTUGIESER PERPETUAL CALENDAR TOURBILLON Operating Instructions Manual page 27

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N O T E
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.
P O R T U G I E S E R P E R P E T U A L C A L E N D A R T O U R B I L L O N