IWC · Portugieser

Strap for Portuguese Chronograph Classic Red Gold

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm

20 mm straps All IWC

Lug width20 mm

Case diameter42 mm

ReferenceIW3904-02 (aka: 3904-02, IW390402)

FamilyPortugieser

MovementIWC caliber 89361 hours, minutes, small seconds | date | Chronograph, Flyback

Year2013

CaseRed Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the Portugieser IW3904-02 (aka: 3904-02, IW390402)

Selected for the 20 mm lug width · workshop selection

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The Portugieser IW3904-02 (aka: 3904-02, IW390402), seen from the bench

The Portugieser IW3904-02 is a 42mm chronograph in 18-carat rose gold featuring the IWC 89361 calibre with flyback function and transparent caseback. The dial displays Arabic numerals and subdials for hours, minutes, and seconds. The 20mm lug width is proportionally calibrated for optimal visual harmony. Rose gold develops a natural patina over time, and the watch combines classical aesthetics with refined engineering without decorative excess.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only