Ingenieur Perpetual Calendar Digital Date-Month Red Gold / Silver

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 17.5 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. 120 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

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.

IW3817-01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver dial with a red gold case. It was a limited edition. Introduced in 2017. 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 displays for both the date and month, leap year display.

5 other watches in the library run the IWC 89800.

IWC

Da Vinci Perpetual Calendar Digital Date-Month Platinum

IW3761-01 · 44 mm

IWC

Da Vinci Perpetual Calendar Digital Date-Month Rose Gold

IW3761-07 · 44 mm

IWC

Da Vinci Perpetual Calendar Digital Date-Month Rose Gold

IW3761-02 · 44 mm

IWC

Ingenieur Perpetual Calendar Digital Date-Month Titanium / Slate

IW3818-02 · 45 mm