IWC IWC - IW5901-01 Portugieser Constant-Force Tourbillon Double Moon Red Gold / Ardoise

Portugieser Constant-Force Tourbillon Double Moon Red Gold / Ardoise

REF. IW5901-01

Case

MaterialRed Gold

Diameter46 mm

ShapeRound

CrystalSapphire

Case backOpen

Water resistance30 m

Dial

ColourGrey

FinishSunburst

IndexesArabic Numerals Hands: Feuille

HandsFeuille

Movement

Caliber94800

Typemanual

Reserve96 h

Explore caliber→

In Context

At 46 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 13.4 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 96 hours of reserve puts it well past a weekend — several days off the wrist and it is still going. At 18,000 vph the seconds hand advances 5 times a second, the slower and more audible rate of an older design.

IW5901-01 is one of 10 executions of the IW5901 base reference. Underneath they are the same watch; what separates this one is a grey sunburst dial and a red gold case. It was a limited edition. Beyond the time it carries a tourbillon.

The IW5901 family

IW5901-01 is one of 10 variants sharing the IW5901 base reference — same watch underneath, different dial, bezel, or bracelet execution. Browse the others:

IWC

Grey · Platinum

IW5901-02 · 46 mm

IWC

Blue · Platinum

IW5901-03 · 46 mm

IWC

Black · Platinum

IW5901-04 · 46 mm

IWC

Silver · Platinum

IW5901-05 · 46 mm

IWC

Blue · Red Gold

IW5901-06 · 46 mm

IWC

Black · Red Gold

IW5901-07 · 46 mm

IWC

Silver · Red Gold

IW5901-08 · 46 mm

IWC

Blue · Platinum

IW5901-09 · 46 mm

+ 1 more variant in this family.

Inside: Caliber 94800

Explore this caliber →

IWC manufactured 94800 calibre (94000-calibre family) is a hand-wound movement with a tourbillon escapement. A patented constant force mechanism is integrated into the tourbillon, ensuring a stable amplitude of the balance - visible through 1 second jumps of the tourbillon. After having run for 48 hours, the constant force mechanism is decoupled and the tourbillon will move in regular 1/5th of a second intervals. It furthermore features a day/night indication, double moonphase display and a 96 hour power reserve.

13 other watches in the library run the IWC 94800.

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