The IWC Portugieser Perpetual Calendar 44 (ref. IW503703) brings refined complexity to the forefront in a stately 44mm white-gold case. Its striking ice-blue dial offers a cool contrast to the warmth of its polished precious-metal exterior, underscoring the reference’s visual distinction within the Portugieser line.

Inside, the self-winding calibre 52616 delivers a comprehensive perpetual calendar, moonphase display, and a remarkable 168-hour (7-day) power reserve. The double-barrel construction ensures long-term accuracy and reliability, while the Pellaton winding system maximises energy efficiency with ceramic components. A domed sapphire crystal and transparent caseback frame the technical depth of the movement, which is decorated to IWC’s exacting standards. Water‑resistant to 30m, the case offers daily wearability despite its mechanical intricacy.

Debuting in 2024, the IW503703 continues a lineage that began with IWC’s pioneering work integrating full perpetual calendars into automatic calibres. The unique dial hue and precious metal case position this reference as a standout among perpetual calendar offerings – balancing contemporary appeal with enduring technical prestige.