Portuguese Family

Portuguese Perpetual Calendar

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reference 5023

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.

Highlights

  • Limited edition of 250 watches in platinum
  • 7-day power reserve
  • Power reserve display
  • Perpetual Calendar
  • Diameter 44.2 mm

Price: $28,700 — $61,500

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Elegant Time Machine

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.

Variations

Details

  • Reference IW502305
  • Case Material platinum
  • Bracelet/Strap black alligator leather strap
  • Dial Colour silver-plated
  • Jewels 62
  • Calibre 51613
  • Price $61,500
  • Limited edition of 250 watches in platinum
  • Mechanical movement
  • Pellaton automatic winding
  • IWC-manufactured 51613 calibre (50000-calibre family)
  • 7-day power reserve when fully wound
  • Power reserve display
  • Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat yellow gold medallion
  • Sapphire glass, convex, antireflective coating on both sides
  • See-through sapphire-glass back
  • Water-resistant 3 bar
  • Case height 15.5 mm
  • Diameter 44.2 mm
  • *IWC Schaffhausen is not the owner of the Glucydur® trademark.

  • Reference IW502307
  • Case Material 18-carat white gold
  • Bracelet/Strap dark brown alligator leather strap
  • Dial Colour ardoise
  • Jewels 62
  • Calibre 51613
  • Price $44,400
  • Mechanical movement
  • Pellaton automatic winding
  • IWC-manufactured 51613 calibre (50000-calibre family)
  • 7-day power reserve when fully wound
  • Power reserve display
  • Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat yellow gold medallion
  • Sapphire glass, convex, antireflective coating on both sides
  • See-through sapphire-glass back
  • Water-resistant 3 bar
  • Case height 15.5 mm
  • Diameter 44.2 mm
  • *IWC Schaffhausen is not the owner of the Glucydur® trademark.

  • Reference IW502306
  • Case Material 18-carat red gold
  • Bracelet/Strap dark brown alligator leather strap
  • Dial Colour silver-plated
  • Jewels 62
  • Calibre 51613
  • Price $40,800
  • Mechanical movement
  • Pellaton automatic winding
  • IWC-manufactured 51613 calibre (50000-calibre family)
  • 7-day power reserve when fully wound
  • Power reserve display
  • Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat yellow gold medallion
  • Sapphire glass, convex, antireflective coating on both sides
  • See-through sapphire-glass back
  • Water-resistant 3 bar
  • Case height 15.5 mm
  • Diameter 44.2 mm
  • *IWC Schaffhausen is not the owner of the Glucydur® trademark.

  • Reference IW502308
  • Case Material stainless-steel
  • Bracelet/Strap dark brown alligator leather strap
  • Dial Colour silver-plated
  • Jewels 62
  • Calibre 51613
  • Price $28,700
  • Limited to 500 watches, available worldwide at IWC boutiques
  • Mechanical movement
  • Pellaton automatic winding
  • IWC-manufactured 51613 calibre (50000-calibre family)
  • 7-day power reserve when fully wound
  • Power reserve display
  • Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat yellow gold medallion
  • Sapphire glass, convex, antireflective coating on both sides
  • See-through sapphire-glass back
  • Water-resistant 3 bar
  • Case height 15.5 mm
  • Diameter 44.2 mm
  • *IWC Schaffhausen is not the owner of the Glucydur® trademark.

Watch Viewer

  • IW502305 Watch Front
  • IW502305 Watch Back
  • IW502307 Watch Front
  • IW502307 Watch Back
  • IW502306 Watch Front
  • IW502306 Watch Back
  • IW502308 Watch Front
  • IW502308 Watch Back

Enlarge

Perpetual Calendar

Analogue date displays with hands have a long tradition in IWC watches featuring perpetual calendars. In the case of the Portuguese Perpetual Calendar, for instance, the date, day and month are to be found on three subdials and, thanks to the clear layout, are extremely easy to read.

The classic moon phase display with discs is usually found at “12 o’clock”. The Ingenieur Constant-Force Tourbillon is one exception and displays the double moon at approximately “1 o’clock”. The moon phase display used in the Portuguese Grande Complication is astonishingly accurate and deviates by just 0.002 per cent, or 1 day, in 122 years. The Portuguese Perpetual Calendar is even more precise. Larger moon phase wheels with a higher number of teeth reduce the deviation so drastically that a future inheritor of the watch would theoretically need to take it to a watchmaker to have the moon phase display adjusted by only 1 day in 577.5 years.

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