Portofino Automatic Day & Night 37 Red Gold

In Context

At 37 mm it sits just under the modern norm — the band that suits the widest spread of wrists. At 11 mm thick it is about average for a modern wristwatch. The case back is closed, so the movement stays out of sight, 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. 42 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

IW459102 stands on its own in this catalogue — no other reference here shares its base number. It pairs a white dial with a red gold case.

The automatic behind the Portofino Day & Night 37, where a disc turning once every twenty-four hours shows a sun or a moon through an aperture and settles the ambiguity a twelve-hour dial leaves. 195 components, Côtes de Genève on the bridges, and central seconds that hack for setting against a reference.

1 other watch in the library runs the IWC 35700.

IWC

Portofino Automatic Day & Night 37

IW459101 · 37 mm