IWC · Portugieser
Strap for Portuguese Yacht Club Chronograph Black
Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
21mm
Lug width21 mm
Case diameter46 mm
ReferenceIW3902-10 (aka: 3902-10, IW390210)
FamilyPortugieser
MovementIWC caliber 89361 hours, minutes, small seconds | date | Chronograph, Flyback
Year2011 - 2015
CaseStainless Steel
Straps for the Portugieser IW3902-10 (aka: 3902-10, IW390210)
Selected for the 21 mm lug width · workshop selection
Matte Black Alligator Strap — Minimal Stitching€149
Millenium Cognac Alligator Strap€195
Matte Blue Alligator Strap€195
Grey Hammered Leather Strap with Ecru Stitching€98
Hammered Calfskin Strap Light Blue€98
The Portugieser IW3902-10 (aka: 3902-10, IW390210), seen from the bench
The Portugieser IW3902-10 is a modern wristwatch chronograph inspired by Portuguese naval heritage. The stainless steel case measures 45.5mm in diameter with a 21mm lug width. It features a three-register chronograph configuration with flyback function and houses the IWC caliber 89361 automatic movement. Water resistance is rated at 30 metres. The dial displays hour, minute, and small-second counters without additional complications, reflecting functional design principles from IWC's Schaffhausen manufacture.
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