iwc PILOT’S WATCH CHRONOGRAPH SPITFIRE Operating Instructions Manual page 15

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.
The patina which develops over time protects the metal. It is
caused by oxidation, and is similar to the tarnish which can
be seen on items made of silver. The environment to which
the metal is exposed and how often it is used affects how
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NOTE
quickly the metal darkens. This is a natural process influenced
by skin contact, humidity, exposure to the elements, etc.
– The surface will not darken uniformly; darker areas and
blemishes may develop.
– Bronze is a traditional material which is not as resistant to
corrosion as those often used in the watchmaking industry
such as stainless steel, titanium, gold and platinum.
– Skin contact will cause bronze to develop a typical metallic
odour when worn (similar to that of coins).
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