Pilot’s Watches

Spitfire Perpetual Calendar Digital Date-Month


reference 3791

For the first time ever, an IWC Pilot’s Watch shows the date and month digitally in large numerals, inspired by instruments – like the altimeter – found in the cockpit. The four-year leap year cycle is also shown digitally. The dynamic interchange of polished and satin-finished surfaces on the 18-carat red gold case with sapphire-glass back gives the watch its premium-quality look.


  • Mechanical chronograph movement
  • 68-hour power reserve
  • Perpetual calendar
  • Large double-digit displays
  • Stopwatch function
  • Diameter 46 mm

Price: $55,900

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In 2012 the Spitfire Perpetual Calendar Digital Date-Month was the first IWC Pilot’s Watch to show the date and month digitally in large numerals and was inspired by cockpit instrumentation like the altimeter. The 4-year leap year cycle also has a digital display. A specially designed quick-action switch generates the energy needed to advance the numeral discs. Every night, when the date display moves forward, it taps a little of the energy, stores it and then discharges it precisely at the end of the month or year. The perpetual calendar can be set easily using the crown. It will not require intervention by a watchmaker until 2100, a year that breaks with the conventional 4-year cycle and will not be a leap year. Hours and minutes recorded by the stopwatch can be read off on the totalizer at “12 o’clock” as easily as reading the time, while the central hand shows elapsed seconds. Thanks to the integrated flyback function, the running stopwatch hand can be reset to zero and immediately starts recording another time. The dynamic interplay of polished and satin-finished surfaces on the 18-carat red gold case gives the watch a premium-quality allure. The shimmering, slate-coloured, metallic dial with its sunpattern finish provides an enchanting contrast to the warm gold tone and the brown of the alligator leather strap. The rotor takes the form of an elegant Spitfire silhouette and can be seen through the sapphire-glass back.



  • Reference IW379105
  • Case Material 18-carat red gold
  • Bracelet/Strap brown alligator leather strap
  • Dial Colour ardoise
  • Jewels 51
  • Calibre 89801
  • Price $55,900
  • Mechanical chronograph movement
  • Self-winding
  • IWC-manufactured 89801 calibre (89000-calibre family)
  • 68-hour power reserve when fully wound
  • Stopwatch function with hours, minutes and seconds
  • Hour and minute counters combined in a single totalizer at 12 o’clock
  • Flyback function
  • Small hacking seconds
  • Perpetual calendar
  • Large double-digit displays for both the date and month
  • Leap year display
  • Screw-in crown
  • Sapphire glass, convex, antireflective coating on both sides
  • Secured against displacement by drop in air pressure
  • See-through sapphire-glass back
  • Water-resistant 6 bar
  • Case height 17.5 mm
  • Diameter 46 mm

Watch Viewer

  • IW379105 Watch Front
  • IW379105 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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