Ingenieur Constant-Force Tourbillon Platinum / Ceramic

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 14 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. 120 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

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.

IW5900-01 is one of 2 executions of the IW5900 base reference. Underneath they are the same watch; what separates this one is a ceramic, platinum case. Beyond the time it carries a tourbillon.

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.

IWC

Portugieser Constant-Force Tourbillon Double Moon Red Gold / Black

IW5901-07 · 46 mm

IWC

Portugieser Constant-Force Tourbillon Double Moon Red Gold / Ardoise

IW5901-01 · 46 mm

IWC

Portugieser Constant-Force Tourbillon Double Moon Red Gold / Blue

IW5901-06 · 46 mm

IWC

Portugieser Constant-Force Tourbillon Double Moon Platinum / Black

IW5901-04 · 46 mm