The Portuguese Perpetual Calendar Reference 5022 boasts an autonomous perpetual calendar with perpetual moon phase display, complete four-digit year display, seven-day automatic movement with Pellaton winding system and power reserve display. Limited to 250 pieces, this masterpiece of the watchmaker’s art from Schaffhausen features a 42 mm platinum case.
The majority of moon phase displays, which are only capable of indicating a moon cycle of 29 days and 12 hours, run incorrectly by a whole day after only 32 months and require adjustment. The IWC calendar, on the other hand, deviates from the actual lunar orbit of 29 days, 12 hours, 44 minutes and 15 seconds by just 12 seconds, giving a deviation of only one day in every 577.5 years.
The autonomous perpetual calendar from IWC relieves the wearer of the need to make any corrections, even in leap years, and always shows all calendar indications on the silver-plated dial correctly: date, day, month and the year in four digits. If the watch is not worn for some time, all the indications, including the moon phase display, can be advanced via the crown by one day at a time.
This will seldom be required, however, because the ingenious mechanism in the IWC 51610 calibre manufactory movement – the largest automatic movement in series production – achieves an absolutely ideal combination. With its patented automatic Pellaton winding system, it produces a power reserve of seven days.
The case of the Ref. 5022 measures merely 42 mm, instead of the 44 mm of its larger sister model.
Model: Portuguese Perpetual Calendar 42mm in platinum
Perpetual calendar, perpetual moon phase display, four-digit year display, mechanicalmovement, automatic Pellaton winding system, power reserve display for sevendays, small seconds hand with stop function, Breguet spring, rotor with 18 ct. gold medallion, platinum variant limited to 250 watches
Vibrations: 21,600/ h / 3 Hz
Power reserve: 7 d (168 h)
Glass: sapphire glass, convex, antireflective, sapphire glass see-through back
Folding clasp: platinum
Water-resistant: 3 bar (30 m)
Diameter: 42.3 mm; Height: 15.6 mm
Weight: Watch in platinum with crocodile leather strap (black): 170 g