The IWC Portugieser Perpetual Calendar 44 (ref. IW503704) brings calendar mastery to the fore within the unmistakable architecture of the Portugieser. Its white-gold case and blue dial contrast with functional elegance, while the perpetual calendar layout is a clear nod to IWC’s long-standing expertise in high-complication design.

The substantial 44mm case houses the in-house calibre 52616 – a self-winding movement delivering a remarkable 168-hour (7-day) power reserve via twin barrels. The perpetual calendar mechanism automatically adjusts for different month lengths and leap years, with displays harmoniously integrated into the dial: date, day, month, year, and moonphase all visible at a glance. The movement also features a Pellaton winding system and is visible through the sapphire caseback, while the case is water-resistant to 30m.

Released in 2024, this reference continues IWC’s tradition of combining technical innovation with balanced aesthetics. The blue dial, distinctive for its clarity and contrast, pairs seamlessly with the precious white-gold case, securing the IW503704’s place as a confident statement among modern complicated watches.