IWC IWC - IW3730-12 Portofino Lady Chronograph MecaQuartz Stainless Steel / Yellow Gold / White / Alligator

Portofino Lady Chronograph MecaQuartz Stainless Steel / Yellow Gold / White / Alligator

REF. IW3730-12

Case

MaterialYellow Gold, Stainless Steel

Diameter29 mm

Lug width16 mm

ShapeRound

CrystalSapphire

Case backClosed

Water resistance30 m

Dial

ColourWhite

IndexesStick / Dot Hands: Stick

HandsStick

Movement

Caliber631

Typequartz

Explore caliber→

In Context

At 29 mm it is small by current standards, in the range most wristwatches occupied before cases began growing through the 1990s. The 7.9 mm case is genuinely slim and goes under a shirt cuff without argument. 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.

It is quartz, so it will hold time far more closely than any mechanical watch here, and asks for a battery every few years rather than a service.

IW3730-12 is one of 19 executions of the IW3730 base reference. Underneath they are the same watch; what separates this one is a white dial and a yellow gold, stainless steel case. Beyond the time it carries a chronograph.

The IW3730 family

IW3730-12 is one of 19 variants sharing the IW3730 base reference — same watch underneath, different dial, bezel, or bracelet execution. Browse the others:

IWC

Black · Rose Gold

IW3730-01 · 29 mm

IWC

White · Rose Gold

IW3730-02 · 29 mm

IWC

Black · Rose Gold, Stainless Steel

IW3730-03 · 29 mm

IWC

White · Rose Gold, Stainless Steel

IW3730-04 · 29 mm

IWC

Black · Stainless Steel

IW3730-05 · 29 mm

IWC

White · Stainless Steel

IW3730-06 · 29 mm

IWC

Black · Yellow Gold

IW3730-07 · 29 mm

IWC

White · Yellow Gold

IW3730-08 · 29 mm

+ 10 more variants in this family.

Inside: Caliber 631

Explore this caliber →

Not a mechanical movement, despite the chronograph. The 631 belongs to the Jaeger-LeCoultre 630 family of mechaquartz calibres built for IWC, in which quartz regulates the rate while a conventional mechanical module drives the chronograph, so the counters snap back on reset as a mechanical chronograph does. The 631 adds a moon phase over the base 630. IWC fitted it through the late 1980s and early 1990s to Portofino, Da Vinci and Pilot's chronographs.

50 other watches in the library run the IWC 631.