Portuguese Family

Portuguese Perpetual Calendar

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Portuguese Perpetual Calendar Reference 5021 - Intro

reference 5032

Apart from the date, day, month and year in four digits, the Portuguese Perpetual Calendar also shows the number of days remaining until the next full moon. The moon’s progress as shown by the watch deviates from its actual course by just 12 seconds each lunar period.

Highlights

  • Pellaton Automatic Winding
  • 7-day Power Reserve
  • Power Reserve Display
  • Perpetual Calendar
  • Diameter 44.2 mm

Price: $37,900 — $41,900

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COUNTDOWN TO THE NEXT FULL MOON

The moon was useful to sailors on the open sea not only for navigational purposes. Its influence on coastal tides has always been of greater importance, because the timing of their ebb and flow is reliably dictated by the moon: at new and full moon, high tides are exceptionally high and low tides exceptionally low. In the English Channel the difference can be up to 11.5 metres and in the Gulf of Maine as much as 21 metres, which illustrates the enormous importance of the moon for shipping. Aside from the date, day, month and year in four digits, the Portuguese Perpetual Calendar also indicates the number of days remaining until the next full moon. The display showing its course and featuring mirror images of the moon in the northern and southern hemispheres deviates from the moon's actual progress by just 12 seconds in one lunar period. The striking colour combination found in the new version in white gold will increase its attractiveness to watch lovers and stargazers: the rhodium-plated moon-phase indicator discs wax and wane thanks to a midnight blue cut-out display in a dial also finished in midnight blue. In the model with the red gold case, the warm tone provides a pleasing contrast to the black dial.

Variations

Details

  • Reference IW503203
  • Case Material 18-carat white gold
  • Bracelet/Strap black alligator leather strap
  • Dial Colour midnight blue
  • Jewels 62
  • Calibre 51614
  • Price $41,900
  • Mechanical movement
  • Pellaton automatic winding
  • 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 for the northern and southern hemispheres
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat 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 IW503202
  • Case Material 18-carat red gold
  • Bracelet/Strap dark brown alligator leather strap
  • Dial Colour black
  • Jewels 62
  • Calibre 51614
  • Price $37,900
  • Mechanical movement
  • Pellaton automatic winding
  • 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 for the northern and southern hemispheres
  • Small hacking seconds
  • Glucydur®* beryllium alloy balance with high-precision adjustment cam on balance arms
  • Breguet spring
  • Rotor with 18-carat 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

  • IW503203 Watch Front
  • IW503203 Watch Back
  • IW503202 Watch Front
  • IW503202 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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