IWC Portofino Automatic Moonphase Red Gold / Silver Ref. IW4594-03

The IWC Portofino Automatic Moon Phase IW4594-03 debuted in 2025. This model features a 40 mm case in 18k red gold, fitted with a sapphire crystal and a solid caseback. Water resistance is 30 meters. It is delivered on a black alligator leather strap. The dial is silver-plated, paired with gold-plated feuille hands and gold-tone applied markers. The moon phase display is positioned at 12 o’clock. Power comes from the self-winding caliber 35800, which has a diameter of 25.6 mm, thickness of 4.8 mm, and a power reserve of 42 hours. The movement beats at 28,800 vph (4 Hz) and contains 25 jewels. Functions include hours, minutes, central seconds, and moon phase.