In 2014, the perpetual calendar with its quick-action switch and large digital display showing the date and month took its place in IWC Schaffhausen’s diver’s watch family.
The distinctly technical design of the dial is characterized by the extra-large numerals of the perpetual calendar, which is mechanically programmed until 2100. The date and month discs have perforated covers. The designers took their inspiration for this particular element from the filter systems that are omnipresent on submarine vehicles. The four-year leap year cycle is also shown digitally. At IWC, the digital display with large numerals has a tradition dating back over 100 years. A subdial at “12 o’clock” displays stop times between one minute and 12 hours as simply as the time of day, using minute and hour hands, while the central hand counts the number of seconds.

The integrated flyback function enables the user to reset the running stopwatch hands to zero and to start another timing sequence immediately. The display also helps divers monitor the speed of their ascents.

The Super-LumiNova®* coating on the hands and indices glows particularly brightly in the dark in two different colours: green for displays relevant to dive time, blue for the hour display.
 

Aquatimer Perpétual Calendar Digital Date-Month

Aquatimer Perpetual Calendar Digital Date-Month - Réf. IW379401 © IWC Schaffhausen

 

With its 49mm case - water-resistant to 10 bar - the Aquatimer Perpetual Calendar Digital Date-Month it is the second-largest wristwatch in IWC’s history. The external rotating bezel is made of 18-carat red gold, as is the protective cover on the left side of the case for the advanced sliding clutch system, which transmits the rotation of the external bezel to the internal rotating bezel. The IWC SafeDive system ensures that the bezel can only be turned anticlockwise. The casing ring, push-buttons and crown are made of rubber-coated titanium.

The see-through sapphire-glass back provides a view of the IWC-manufactured 89801 movement, which comprises 474 individual parts.

The black rubber strap with its black alligator leather inlay guarantees maximum comfort in wear and a long service life.