Portuguese Perpetual Calendar 5021 Rose Gold / Black

In Context

At 44.2 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 15.5 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. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

IW5021-19 is one of 7 executions of the IW5021 base reference. Underneath they are the same watch; what separates this one is a black dial and a rose gold case. Beyond the time it carries a perpetual calendar.

Automatic movement with seven days power reserve and perpetual calendar. The 51612 was the first 7-day perpetual calendar with the 21600 frequency.

1 other watch in the library runs the IWC 51612.

IWC

Big Pilot Perpetual Calendar White Gold / Ardoise

IW5026-03 · 46.2 mm