IWC Schaffhausen 5045 Mode D'emploi page 13

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T H E T E C H N I C A L R E F I N E M E N T S
O F T H E 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 DA R T O U R B I L L O N
Your IWC watch shows you the time in hours and minutes, the
moon phase, the day, the date, the month and the year in four
digits, as well as the remaining power reserve. The mechanical
movement with automatic winding has a power reserve of approx­
imately 7 days (168 hours) when fully wound. Your Portugieser
Perpetual Calendar Tourbillon is protected by an arched­edge
sapphire glass of hardness grade 9 on Mohs' scale. Your watch
is water­resistant 3 bar. The engraved rotor made of 18­carat red
gold winds the watch in both directions of rotation via the Pellaton
winding system. Your watch is equipped with a flying minute tour­
billon, a unique micro mechanism, which minimizes the effect of
gravity on the accuracy. The tourbillon, an invention made in the
aftermath of the French Revolution, has always been regarded
as the ultimate challenge in the quest for absolute mechanical
watchmaking precision. More specifically, the purpose of the
mechanism is to counterbalance the one­sided pull of the earth's
gravity on the balance. This is because the residual gravitational
error of the balance influences the accuracy, depending on the
position of the watch. Fortunately, there is a way to overcome
this problem caused by one of the basic laws of physics: the
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
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balance, the pallets and the escape wheel are mounted in a
minute cage that rotates around itself once every minute. In this
way, the effect of the gravitational error is practically eliminated.
To ensure that this extraordinary watch continues to perform
faultlessly in the future, it is essential to observe a few important
operating instructions.
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