Portugieser Perpetual Calendar Digital Date-Month Edition "75th Anniversary" Red Gold / Black

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 16.5 mm it is very tall, and sits high off the wrist. 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. 68 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

IW3972-02 is one of 4 executions of the IW3972 base reference. Underneath they are the same watch; what separates this one is a black dial and a red gold case. It was a limited edition. Introduced in 8980. Beyond the time it carries a perpetual calendar.

Mechanical chronograph movement, stopwatch function with hours, minutes and seconds, hour and minute counters combined in a totalizer at 12 o'clock, flyback function, small hacking seconds, perpetual calendar, large double-digit display for both the date and month, leap year display.

9 other watches in the library run the IWC 89801.

IWC

Portugieser Perpetual Calendar Digital Date-Month Edition "75th Anniversary" Red Gold / Blue

IW3972-04 · 45 mm

IWC

Portugieser Perpetual Calendar Digital Date-Month Edition "75th Anniversary" Platinum

IW3972-01 · 45 mm

IWC

Pilot's Watch Spitfire Perpetual Calendar Digital Date-Month Stainless Steel

IW3791-07 · 46 mm

IWC

Portugieser Perpetual Calendar Digital Date-Month Edition "75th Anniversary" Red Gold / Silver

IW3972-03 · 45 mm