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
Lug width20 mm
Case diameter42 mm
ReferenceIW3904-02 (aka: 3904-02, IW390402)
FamilyPortugieser
MovementIWC caliber 89361
Hours, Minutes, Small Seconds | Date | Chronograph, Flyback
CaseRed Gold
Straps for the Portugieser IW3904-02 (aka: 3904-02, IW390402)
Selected for the 20 mm lug width · workshop selection
Green Rubberized Alligator Strap with Ecru Tribal Stitching€185
Novonappa Black Strap — IWC Pilot Style€149
Black Alligator Strap with Light Blue Edges€210
Black Alligator Strap with White Edges€210
Millenium Cognac Alligator Strap€270
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only