IWC Portofino Portofino Chronograph MecaQuartz Stainless Steel / White / Calf

Reference IW3731-05

IWC Portofino Chronograph MecaQuartz Stainless Steel / White / Calf

About this watch

The IWC IW3731-05 Portofino Chronograph MecaQuartz is a stunning timepiece that beautifully blends tradition with modern technology. Its elegant design, innovative movement, and practical features make it a remarkable example of what IWC has to offer. The watch's sleek stainless steel case glimmers under light, while the white dial offers perfect contrast for readability. The rounded shape and minimalist aesthetic make it a versatile accessory suitable for both formal and casual occasions. At its core lies the remarkable Jaeger-LeCoultre caliber 631, often referred to as the 'MecaQuartz.' This movement combines quartz accuracy with mechanical chronograph functionality, resulting in impeccable precision. With functions for hours, minutes, small seconds, and a date display, this watch is more than just a pretty face. The chronograph allows you to time events with ease, making it practical for everyday use. The watch features stick hands that glide smoothly over the dial, providing a classic look that matches its overall aesthetic. A high-quality calf leather strap complements the watch's elegance while ensuring a comfortable fit. With a water resistance rating of 30 meters, this watch is suitable for daily wear but not designed for diving adventures.

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Key Features

Jaeger-LeCoultre caliber 631 movement
Sleek stainless steel case
White dial with stick and dot indexes
Chronograph functionality
High-quality calf leather strap
Water resistance up to 30 meters

Specifications

Brand

IWC

Family

Portofino

Model

Portofino Chronograph MecaQuartz Stainless Steel / White / Calf

Reference

IW3731-05

Movement

631

Movement Features

Hours, Minutes, Small Seconds
Date
Chronograph

Case

Yellow Gold 35mm

Dial Color

White

Crystal

Sapphire

Water Resistance

Current Listings

IWC Portofino 42MM Black Dial, Stainless Steel Full Set

IWC - IW391010 · $4,000

This 2018 IWC Portofino Chronograph features a black dial, stainless steel case and Milanaise bracelet. It includes day and date display, small hacking seconds, chronograph function and is a full set with original box, warranty card and manual.

Condition: beautiful condition with no visible scratches
Bracelet Type: Milanaise
Case Size: 42MM

Posted at

May 22, 2026, 8:14 PM

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2025 NEW IWC Portofino Chronograph Black IW391404 39mm Full Set - $5,995

IWC - IW391404 · $5,995

A 2025 IWC Portofino Chronograph Black IW391404 is available for sale. It features a chronograph function and comes with a full set including the watch, box, travel case, international warranty card, and instructions manual.

Condition: New condition
Size: 39mm diameter
Year: 2025
Case Contents: Watch, Box, Travel Case, International Warranty Card, Instructions Manual

Posted at

May 21, 2026, 10:00 PM

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IWC Portofino Chronograph — 42mm — Ref. IW391029 — $2,699 Shipped 🔥

IWC - IW391029 · $2,699

This IWC Portofino Chronograph features a clean, timeless case design paired with a classic chronograph layout. It's a refined everyday luxury chronograph that wears well at 42mm.

Condition: Fair overall
Case Diameter: 42mm
Condition Notes: Crystal has minor AR coating wear, Bezel, case, caseback, and clasp show hairlines from normal wear

Posted at

May 20, 2026, 9:35 PM

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IWC Portofino Automatic Moonphase 40mm IW459402 – Box/Watch/Papers – $5000 - Warranty until 11/2029!

IWC - IW459402 · $5,000

This IWC Portofino Automatic Moonphase features a 40mm case. The watch comes with its original box, papers, and is still under warranty until 11/2029.

Box: yes, included
Papers: yes, included
Warranty: until November 2029

Posted at

May 20, 2026, 5:54 PM

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IWC Portofino Automatic Moon Phase Limited Edition Year of the Snake Ref IW459604 37mm Full Kit 2025 $7,850

IWC - IW459604 · $7,850

The IWC Portofino Automatic Moon Phase Limited Edition Year of the Snake is a striking and elegant limited-edition piece that blends classic dress watch refinement with artistic flair. The 37mm polished stainless steel case paired with the rich burgundy/red dial gives this watch an eye-catching yet tasteful presence on the wrist.

Condition: great condition
Case size: 37.1 mm
Thickness: 11.3 mm
Dial color: burgundy/red

Posted at

May 16, 2026, 4:24 PM

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