IWC · Portugieser
Strap for Portuguese Chronograph Classic Red Gold / Ardoise
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
18mm
Lug width18 mm
Case diameter42 mm
ReferenceIW3904-05 (aka: 3904-05, IW390405)
FamilyPortugieser
MovementIWC caliber 89361
Hours, Minutes, Small Seconds | Date | Chronograph, Flyback
CaseRed Gold
The Portugieser IW3904-05 (aka: 3904-05, IW390405), seen from the bench
The IWC Portugieser IW3904-05 represents the contemporary evolution of an icon born in 1939, blending neoclassical geometry with precision craftsmanship. This 18-karat rose gold case measures 42mm in diameter and houses the IWC 89361 calibre, an in-house movement featuring hours, minutes, small seconds, flyback chronograph function, and date. The 18mm lug width ensures harmonious proportions between case and strap, while the domed sapphire crystal enhances depth perception. Rose gold naturally develops a deeper reddish patina over time, characterizing the vintage aesthetic that collectors appreciate.
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