iwc IW3921 Operating Instructions Manual page 8

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watch is water­resistant 3 bar. The
engraved rotor made of 18­carat gold
winds the watch in both directions of
rotation via IWC's double­pawl wind­
ing. In addition to the uniqueness of
its functions, it is the display's legibil­
ity and the ease with which it can be
used that distinguishes this watch from
all other complicated timepieces. To
ensure that this extraordinary watch
continues to perform faultlessly in the
future, it is essential to observe a few
important operating instructions.
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