Portofino Automatic Moonphase Stainless Steel / Silver / Alligator

In Context

At 40 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 9.5 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.

IW4594-01 is one of 3 executions of the IW4594 base reference. Underneath they are the same watch; what separates this one is a silver dial and a stainless steel case. Beyond the time it carries a moon phase.

The 35800 is IWC's Sellita-based automatic with a moon phase at 12 o'clock, the movement of the Portofino Automatic Moon Phase 37. It powers 20 watches in this library. It is the 35111 family, a Sellita SW300 built to IWC's specification, with a moon-phase module on top: 25 jewels, a 42-hour reserve and a beat of 28,800 vph at 25.6 mm across, with the date at 3 o'clock and the moon under a window at 12. The glossary explains the [moon phase](/glossary/moon-phase) display. In the library it powers 16 [Portofino](/brands/iwc/portofino) Automatic Moon Phase references at 37 mm and 40 mm, in steel and red gold, several with diamonds, and 4 [Da Vinci](/brands/iwc/da-vinci) Automatic Moon Phase 36 references of 2017. 2 are limited editions. The [35111](/calibers/iwc-35111) is the same base without the moon phase, and the [59800](/calibers/iwc-59800) the hand-wound eight-day movement with a moon phase in the 45 mm Portofino.

19 other watches in the library run the IWC 35800.

IWC

Portofino Automatic Moon Phase 37 Red Gold / Diamond / Silver / Bracelet

IW459010 · 37 mm

IWC

Portofino Automatic Moon Phase 37 Red Gold / Diamond / MOP

IW459002 · 37 mm

IWC

Portofino Automatic Moonphase Red Gold / Silver

IW4594-03 · 40 mm

IWC

Portofino Automatic Moon Phase 37 Red Gold / Diamond / Silver

IW4590-14 · 37 mm