Portofino Day & Night 34 Stainless Steel - Diamond / Blue

In Context

At 34 mm it is classically proportioned: the size a dress watch was understood to be for most of the twentieth century, and small enough to sit under a cuff. At 8.9 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. 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. 50 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.

IW6598-01 is one of 2 executions of the IW6598 base reference. Underneath they are the same watch; what separates this one is a blue sunburst dial and a stainless steel case.

Built on a Sellita SW300-1 and fitted to the Portofino Automatic Day & Night 34. A disc geared to turn once every twenty-four hours brings a sun or a moon into an aperture, so the watch shows where it stands in the day rather than merely repeating the hour twice over. The central seconds hack for setting.

3 other watches in the library run the IWC 35180.

IWC

Portofino Day & Night 34 Stainless Steel / Silver

IW4598-01 · 34 mm

IWC

Portofino Day & Night 34 Red Gold - Diamond / Silver

IW6598-02 · 34 mm

IWC

Portofino Day & Night 34 Rose Gold / Silver

IW4598-05 · 34 mm