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Experiences

Cal. 87

Date2011-09-28T14:05:45

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Of the many legendary hand-wound movements made by IWC, the 87 calibre holds a very special place.

This is because it was the first tonneau-shaped wristwatch movement that could be fitted into both rectangular and tonneau-shaped wristwatch cases, which were very much en vogue in the 1930s. With its screw balance and Breguet spring – but minus a shock-absorption system – it was extremely accurate and showed the precise time on a small seconds and the hour and minute hands. Altogether, 18,400 of them were produced between 1931 and 1947. Today, IWC watches with the 87 calibre are much-coveted collector’s items.

  • Dimensions: 20 × 25 mm
  • Height: 3.65 mm
  • Frequency: 18,000 bph (2.5 Hz)
  • Number of jewels: 15, 16 and 17

A SIMPLE, TIMELESSLY ELEGANT WATCH COMBINING OUTSTANDING DESIGN AND FUNCTIONALITY.

Explore More Articles
IWC Da Vinci Perpetual Calendar Sketch
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During his time as head watchmaker at IWC, Kurt Klaus translated the Gregorian calendar with all its many irregularities into a mechanical program that will continue running perfectly until 2499 with virtually no corrections from outside.

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.

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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.

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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.