Portugieser Hand-Wound Tourbillon Armor Gold / Silver

In Context

At 42.4 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 10.8 mm thick it is about average for a modern wristwatch. 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. 60 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 84 hours of reserve puts it well past a weekend — several days off the wrist and it is still going. At 28,800 vph the seconds hand advances 8 times a second.

IW5458-01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver dial with a armor gold case. Introduced in 2021. Beyond the time it carries a tourbillon.

A hand-wound calibre built for the Portugieser Hand-Wound Tourbillon, carrying a one-minute flying tourbillon supported from below rather than bridged over the top. The carriage runs to 56 parts and weighs 0.635 grams. Pallet lever and escape wheel are silicon, coated with IWC's Diamond Shell to cut friction, and the tourbillon can be stopped to set the watch exactly.