URWERK UR-112 Aggregat Back to Black Limited Edition

Inspired by the stunning Bugatti Atlantic Type 57 SC, the URWERK UR-112 Aggregat Back to black watch features a steel and titanium body with a complex architecture.

On its upper part, this timepiece has a grooved and open-worked steel bonnet. This cover opens vertically to give access to the secondary power-reserve and digital seconds indications.

Its central titanium body is satin-brushed, sandblasted and bead-blasted, thereby forming a field of functional microdots. The two blackened steel wings of the UR-112 Aggregat Back to black fit into this central body. Each zone, each space, each element has its own texture, its own finish, its own language.

The UR-112 Aggregat Back to Black belongs to the Special Project line. This is a departure from the founding concept of URWERK’s wandering-hour indication, on a whole new scale, with new volumes for the UR-122 Aggregat and its UR-13.01 caliber.

There are no cubes, no carousel with satellites, no 120-degree sector-type indication like on so many models that have marked the history of URWERK over the last 25 years.

The UR-112 AggregatBack to Black displays jumping hours and trailing minutes on prisms. Shifted to the front of the watch, they’re visible in their large sapphire crystal housings. As the hours jump on one side and the minutes advance in five-minute increments on the other, an additional trailing indicator shows the accurate minutes.

The central body of the case contains the driving and regulating components of the UR-13.01 caliber. A large barrel providing 48 hours of power reserve is coupled with an automatic-winding rotor.

Pressing the two pushers on the sides of the watch opens the cover and reveals the power-reserve indicator and the spectacular small seconds. The latter is composed of a skeletonized silicon disk attached to a red anodized aluminum bridge, a typical URWERK design feature.

A transmission shaft stands out in the middle of this incredible mechanism. To guarantee its lightness and rigidity, it’s made of titanium and ensures the coupling with the display module, located at the front of the shell. It establishes this link thanks to a new succession of gears that drive the hours and minutes prisms via two 90° bevel gears.

The black aluminum prisms featuring grooved sides are enhanced with Super-LumiNova and secured by planetary systems that ensure they rotate both on their axis and in space.

Technical details

Model: UR-112 Aggregat Back to black

Caliber UR-13.01 automatic
Jewels: 66
Escapement: Swiss lever-type
Frequency: 4 Hz; 28,800 vph
Power reserve: 48 hours
Materials: Aluminum hours and minutes satellite prisms; titanium transmission shaft, silicon seconds wheel
Surface finishing: Circular-graining, sandblasting, Côtes de Genève, polished screw heads

Jumping digital hours and trailing digital minutes on satellite prisms; digital seconds; power-reserve indicator

Dimensions: Width 42 mm; length 51 mm; thickness 16 mm
Materials: DLC treated titanium and steel
Glass: Sapphire crystal
Water resistance: Pressure tested to 3 ATM / 100 ft / 30 m

25-piece limited edition

CHF 280,000 (excluding tax)