The Big Pilot's Watch and the perpetual calendar are a perfect match. The four sub dials and the four-digit year display are shown off to high effect on the large dial. The date, weekday, month and moon phase are also effortless to read. For the first time, IWC is now combining a Big Pilot's Watch Perpetual Calendar with a sand-coloured ceramic case, the hallmark of its 'Mojave Desert' editions. The subdued dark brown dial and the sand-coloured rubber strap with textile inlay complement the unique military design. The inspiration came from the flight suits of Navy pilots and the barren landscape of China Lake, the US Navy's largest land area in the Mojave Desert. The perpetual calendar is mechanically programmed to automatically recognise the different months lengths and the leap years. It will continue running correctly without any manual correction until the year 2100. The calendar module is driven by a single nightly switching impulse delivered by the IWC-manufactured 52615 calibre. Two barrels, wound up by a Pellaton winding system with ceramic components, store a comfortable seven days power reserve.