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IWC. A fine 18K gold automatic perpetual calendar wristwatch with moon phase and 7 day power reserve Portugieser Perpetual Calendar, Ref: IW502106, Purchased 5th October 2007 image 1
IWC. A fine 18K gold automatic perpetual calendar wristwatch with moon phase and 7 day power reserve Portugieser Perpetual Calendar, Ref: IW502106, Purchased 5th October 2007 image 2
IWC. A fine 18K gold automatic perpetual calendar wristwatch with moon phase and 7 day power reserve Portugieser Perpetual Calendar, Ref: IW502106, Purchased 5th October 2007 image 3
Lot 6Y

IWC. A fine 18K gold automatic perpetual calendar wristwatch with moon phase and 7 day power reserve
Portugieser Perpetual Calendar, Ref: IW502106, Purchased 5th October 2007

11 December 2025, 14:30 GMT
London, New Bond Street

£7,000 - £9,000

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IWC. A fine 18K gold automatic perpetual calendar wristwatch with moon phase and 7 day power reserve

Model: Portugieser Perpetual Calendar
Reference: IW502106
Date: Purchased 5th October 2007
Movement: 66-jewel Cal.50611 automatic, No.2930574
Dial: Silvered, gilt Arabic numeral hour markers, gilt dot outer minute divisions, subsidiary dials at 3, 6, 9 and 12 for calendar with 7 day power reserve, month, day with seconds and moon phase indication, year indication at 8, gilt leaf hands
Case: Brushed and polished round, exhibition back secured by 6 screws, No.2920337
Strap/Bracelet: Black IWC alligator leather
Buckle/Clasp: Signed 18K gold folding clasp
Signed: Case, dial & movement
Size: 44mm
Accompaniments: IWC box, outer card, guarantee card, delivery check tag, encased century slide, operating instructions polishing cloth

Footnotes

The IWC Portugieser Perpetual Calendar Ref. IW502106, introduced in 2006, is a stunning example of IWC's commitment to precision and innovation. Powered by the Calibre 50611 automatic movement, it boasts a 7-day power reserve and features the renowned Pellaton winding system, developed by Albert Pellaton in 1944. This system ensures efficient winding in both directions, providing long-lasting reliability.

Initially created as a tool for explorers, the Portugieser collection has become synonymous with elegance and sophistication. The Portugieser Perpetual Calendar showcases IWC's mastery of complicated horology, with a perpetual calendar that automatically adjusts for leap years and varying month lengths. The moon phase complication, accurate to within one day every 577.5 years, speaks to IWC's ability to combine functionality with design.

Additional information