Portuguese Perpetual Calendar Tourbillon Armor Gold / Bucherer

In Context

At 45 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 15.3 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

The movement winds itself from the motion of your wrist. 168 hours of reserve puts it well past a weekend — several days off the wrist and it is still going.

IW504-507 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver matte dial with a red gold case. It was a limited edition. Beyond the time it carries a perpetual calendar and a tourbillon.

IWC's caliber 51950 is a self-winding movement with tourbillon and perpetual calendar. It is based on the earlier 51900 - with the addition of the module for the calendar.

6 other watches in the library run the IWC 51950.

IWC

Big Pilot's Watch Perpetual Calendar Tourbillon Le Petit Prince

IW504803 · 46.2 mm

IWC

Portuguese Perpetual Calendar Tourbillon Armor Gold / Blue / Boutique Edition

IW5045-04 · 45 mm

IWC

Portuguese Perpetual Calendar Tourbillon Platinum / Blue

IW5045-06 · 45 mm

IWC

Big Pilot's Watch Perpetual Calendar Tourbillon Le Petit Prince

IW5049-01 · 46.2 mm