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Ingenieur Constant-Force Tourbillon
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breguet_spring
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IWC Portugieser Annual Calendar
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The New Small Eternity

The new IWC Annual Calendar with the 52850 in-house movement reduces the calendar problem to a single manual adjustment at the end of February. And that‘s it.

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Where time flies

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A matter of adjustment

For an IWC watch to run accurately, the oscillations of the balance require careful adjustment.

Unruhreif_Spirale.jpg
Balance of power

A mechanical watch continues to show the correct time even as the tension in the mainspring diminishes. Making this possible is a mechanism that has been gradually improved for over 300 years: the escapement.

IWC 52000 Calibre Movement
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Experiences

51011 Calibre

Photos — Christian Coigny and Hans-Ruedi Rohrer Date — 1 April, 2010

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Experience - 51011 Calibre - Hero
—In 2000, after five years of development, IWC unveiled the Portuguese Automatic with the 5000 calibre, a movement that had been designed and produced in its own workshops
Portuguese Automatic

—The IWC manufactured 51011 calibre integrates the finest features ever to grace an automatic movement

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It’s no accident that this calibre has a gold medal

—Kurt Klaus, the legendary watchmaker who further improved this movement

Also rightly called the big IWC calibre. Manufactured in-house at the factory in Schaffhausen, it resulted from the first movement in the 5000-calibre family for a limited series of Portuguese watches in 2000. It also marked the revival of the Pellaton pawl-winding system at IWC. The version of the 51011 illustrated here, featuring circular graining, nickel plating and Geneva stripes decoration, is the driving force behind the Portuguese Automatic with small seconds, date and power reserve display.

Explore More Articles
Ingenieur Constant-Force Tourbillon
The constant is the force

IWC's constant-force mechanism ensures that the escapement delivers an absolutely even supply of power and delivers unprecedented precision.

breguet_spring
Increased precision
down to the overcoil

In some IWC calibres, the balance rim oscillates to and fro on a Breguet spring. The terminal coil is painstaking shaped by hand and plays a significant role in ensuring that the balance oscillates with perfect regularity, thus increasing the watch's precision.

IWC Portugieser Annual Calendar
IWC Annual Calendar:
The New Small Eternity

The new IWC Annual Calendar with the 52850 in-house movement reduces the calendar problem to a single manual adjustment at the end of February. And that‘s it.

IWC Portugieser Tourbillon Mystère Rétrograde
Where time flies

Ask watchmakers, and one thing is soon clear: their favourite complication is the tourbillon.

IWC 52010 calibre
Pellaton's ingenious automatic meets state-of-the-art engineering

A matter of adjustment

For an IWC watch to run accurately, the oscillations of the balance require careful adjustment.

Unruhreif_Spirale.jpg
Balance of power

A mechanical watch continues to show the correct time even as the tension in the mainspring diminishes. Making this possible is a mechanism that has been gradually improved for over 300 years: the escapement.

IWC 52000 Calibre Movement
IWC’s New
Proprietary 52000-Calibre
Family

The newly developed 52000-calibre family, developed and produced in-house will feature numerous technical improvements.