IWC · Portugieser
Strap for Portugieser Constant-Force Tourbillon Double Moon Red Gold / Blue
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 diameter46 mm
ReferenceIW5901-06 (aka: IW590106)
FamilyPortugieser
MovementIWC caliber 94800 minutes, hours, small seconds | moonphase | Constant Force Mechanism, tourbillon escapement, power reserve indicator
Year2017
CaseRed Gold
Straps for the Portugieser IW5901-06 (aka: IW590106)
Selected for the 18 mm lug width
Vintage Brown Calfskin Strap — Natural Patina€98
Hammered Pink Strap with Ecru Stitching€98
Hammered Yellow Strap with Ecru Stitching€98
Grey Hammered Leather Strap with Ecru Stitching€98
Swift Red Leather Strap€120
Hammered calfskin strap in cuoio€98
The Portugieser IW5901-06 (aka: IW590106), seen from the bench
The Portugieser Constant-Force Tourbillon Double Moon Red Gold / Blue model IW5901-06 represents the pinnacle of IWC watchmaking heritage. It features a 46 mm red gold case, powered by the automatic IWC 94800 caliber with constant-force mechanism, tourbillon escapement, and power reserve indicator. The 18 mm lug width accommodates matching straps precisely. The blue dial displays hours, minutes, small seconds, moonphase, and power reserve in geometric harmony, protected by a sapphire crystal and screw-down crown rated to 60 meters water resistance.
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