The moon phase display on the Portuguese Perpetual Calendar, Reference 5023, is a grand-scale theatre on a tiny stage. In other respects, this elegant, up-to-the-minute timepiece leaves virtually no wish unfulfilled: perpetual calendar, four-digit year display, seven-day automatic movement with Pellaton winding system and a power reserve display. The moon phase display on the Portuguese Perpetual Calendar, Reference 5023, is a grand-scale theatre on a tiny stage. Attended by a cluster of embossed stars, the moon rises behind the hemispherical cut-out on the left and waxes to full moon in the centre, before disappearing on the right-hand side. IWC’s design engineers have calculated that the moon phase display deviates from the duration of the moon’s actual course by just one day in 577.5 years. No one has so far noticed the difference. In other respects, this elegant, up-to-the-minute timepiece leaves virtually no wish unfulfilled with its perpetual calendar, window showing the year in four digits and a 7-day automatic movement with the Pellaton winding system and a power reserve display. Reference 5023 is available in three versions: in a platinum case with a silver-coloured dial; in a red gold case with a silver-coloured dial and a red-gold-plated moon against a blue background; or slightly more restrained, in white gold with rhodium-plated appliqués on a slate-coloured dial with a sun-pattern finish.
