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The Ingenieur Perpetual Calendar 41 is the first stainless steel model to combine the Gérald Genta-inspired Ingenieur design with the perpetual calendar developed by Kurt Klaus.
ABOUT THE WATCH
Ingenieur Perpetual Calendar 41
The Ingenieur Perpetual Calendar 41 is the first stainless steel model to combine Gérald Genta’s visionary Ingenieur design with Kurt Klaus’ crown-operated perpetual calendar. The watch features a 41-millimetre case and integrated bracelet made of stainless steel, a blue dial, and rhodium-plated hands and appliques. Seamlessly integrated into the case via a middle-link attachment, the H-link bracelet with a butterfly clasp ensures excellent wearing comfort. The characteristic bezel, a hallmark feature of Gérald Genta’s design, is secured to the case with five functional screws. The case and bezel are elaborately finished with a combination of satin-finished and polished surfaces. The H-links of the bracelet are satin-finished with polished outer edges, while the middle links and the case back ring are polished. Another highlight is the dial with the characteristic «Grid» pattern, consisting of small lines and squares. It adds additional depth to the dial and reflects the light exquisitely.
The subdials displaying the calendar information are treated with a sunray finish, while the outer edges feature a refined «azurage». The rhodium-plated metal markers and the hands are filled with Super-LumiNova®. The perpetual calendar displays the date, day of the week, month, and moon phase on the dial. Thanks to a reduction gear train using two intermediate wheels, the moon phase display will only deviate by one day after 577.5 years. In addition to showing the day of the week, the subdial at 9 o’clock also features a small leap year indicator, which counts down the years to the next leap year. The IWC-manufactured 82600 calibre features a Pellaton winding system. Equipped with components made of virtually wear-free zirconium oxide ceramic, it reliably builds up a power reserve of 60 hours in the mainspring. The movement is finished with circular graining, Geneva stripes and blued screws and can be observed through the sapphire glass case back.
Perpetual calendar | IWC Schaffhausen
In the early 1980s, IWC’s head-watchmaker Kurt Klaus set out on an engineering journey to translate the Gregorian calendar with its many irregularities into a mechanical program for a wristwatch. His ingenious perpetual calendar, which debuted in the Da Vinci Perpetual Calendar in 1985, comprises only about 80 parts and displays the date, day, month, year in four digits, and the moon phase. The smart mechanical program automatically recognises the different length of the months, and even adds a leap day at the end of February every four years. The moon phase display is so precise that it will deviate from the actual phase of the moon by just one day after 577.5 years. All displays are perfectly synchronised and can be adjusted simply by turning the crown. Some models come with an additional century slide, so the watch can continue showing the date until 2499. The calendar only needs a small adjustment in those centurial years that skip the leap year, which is the case in 2100, 2200, and 2300. Some versions of the calendar feature a double moon phase display, showing the moon phase on the northern and southern hemispheres.
Features
Case
Movement
Packaging
Pellaton automatic winding
Perpetual calendar with displays for the date, day, month, leap year and perpetual moon phase
Sapphire glass, convex, antireflective coating on both sides
Glass secured against displacement by drop in air pressure
Case
Stainless steel
Case
Diameter
41.6
mm
Height
13.3
mm
Screw in crown
true
Back case
See-through sapphire glass back
Water resistance
10.0
bar
Calibre
82600
Calibre
Movement type
Automatic winding,
IWC-manufactured movement
