Ingenieur Family

Ingenieur Perpetual Calendar Digital Date-Month


reference 3792

Every time the date display advances, IWC’s quick-action switch siphons off a little energy and makes it available at the end of the month. At the end of the year, thanks to the three semi-transparent totalizers, the entire dial is set in motion. The perpetual calendar takes the 29th day of February into account every 4 years, and will remain accurate until 2100.


  • Case made of titanium aluminide
  • 68-hour power reserve
  • Perpetual calendar
  • Large displays for the date and month
  • Combined hour and minute counters
  • Flyback function

Price: $49,700

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With the Ingenieur Perpetual Calendar Digital Date-Month, IWC presented a watch case made of titanium aluminide and reaffirmed its reputation as the materials pioneer in the watchmaking industry. Titanium aluminide is used widely in motorsport: the alloy is lighter and more robust than pure titanium. The black parts of the case are made of zirconium oxide, yet another material typically associated with FORMULA ONE. Modern racing cars have a boost button designed to provide maximum thrust when needed. In the case of the perpetual calendar with its digital date and leap year display, this job is handled by IWC’s revolutionary quick-action switch. Every night, when the date display advances, this sophisticated mechanism siphons off a little energy, stores it and then discharges it precisely at the end of the month to rotate the display discs. At the end of the year, no fewer than five display discs need to be advanced synchronously. On New Year’s Eve, thanks to the three semi-transparent totalizers, the entire dial is set in motion. It is a spectacle of technical brilliance that no one who appreciates complex mechanical systems will want to miss. The see-through sapphire-glass back provides an unimpeded view of the IWC-manufactured 89802 calibre, whose rotor resembles the spokes on a light alloy wheel rim.



  • Reference IW379201
  • Case Material titanium aluminide
  • Bracelet/Strap black rubber strap with alligator leather inlay
  • Dial Colour black
  • Jewels 51
  • Calibre 89802
  • Price $49,700
  • Mechanical chronograph movement
  • Self-winding
  • IWC-manufactured 89802 calibre (89000-calibre family)
  • 68-hour power reserve when fully wound
  • Perpetual calendar
  • Large double-digit displays for both the date and month
  • Leap year display
  • Stopwatch function with hours, minutes and seconds
  • Hour and minute counters combined in a totalizer at 12 o’clock
  • Flyback function
  • Small hacking seconds
  • Screw-in crown
  • Sapphire glass, flat, antireflective coating on both sides
  • See-through sapphire-glass back
  • Water-resistant 12 bar
  • Case height 17 mm
  • Diameter 46 mm

Watch Viewer

  • IW379201 Watch Front
  • IW379201 Watch Back


Digital Date Display

IWC produced the first “digital” watches in its history as early as 1884. These timepieces, known as Pallweber watches, displayed the hours and minutes using numerals, while the seconds were shown in analogue form with a hand. In 2009, IWC unveiled a surprise for watch lovers in the form of a newly developed perpetual calendar movement, which shows not only the date but also the month in large numerals. In 2013, the year of the Ingenieur, tinted glass inlays on the dial of the Ingenieur Perpetual Calendar Digital Date-Month provide a view of the discs at work. The energy required to advance the month display discs is built up continuously throughout the month by a quick-action switch. A spring-loaded lever on the quick-action switch is lifted a tiny bit further each day by a cam. At the end of the month, the tension in the spring has reached its maximum, and it is time for all that energy to be released; the quick-action switch jumps instantaneously to its starting position and advances both of the month display discs individually, or together, by one position, depending on the month. On 31 December, the leap year disc is also advanced at the same time.

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