IWC · Portugieser
Strap for Portuguese Yacht Club Chronograph
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 diameter46 mm
ReferenceIW3902-04 (aka: 3902-04, IW390204)
FamilyPortugieser
MovementIWC caliber 89361 hours, minutes, small seconds | date | Chronograph, Flyback
Year2010 - 2011
CaseStainless Steel
Straps for the Portugieser IW3902-04 (aka: 3902-04, IW390204)
Selected for the 20 mm lug width · workshop selection
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Millennium Green Alligator Strap€195
Black Rubberized Alligator Strap with Red Tribal Stitching€185
Vintage Olive Green Calf Leather Watch Strap€80
Italian Calfskin Rally Strap in Cognac€110
The Portugieser IW3902-04 (aka: 3902-04, IW390204), seen from the bench
The IWC Portugieser IW3902-04 is a mechanical chronograph with a 45.50mm stainless steel case and 20mm lug width, powered by the IWC 89361 movement featuring hours, minutes, small seconds, date, and flyback chronograph function. Born in 1939 for Portuguese navigators, this model reinterprets the classic Portugieser with contemporary proportions and integrated case design. The watch combines technical excellence with refined aesthetics, delivering precision and legibility without compromise.
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