URWERK UR-105 TTH (Tantalum Hull) Limited Edition

Independent Swiss watch brand URWERK presents UR-105 Tantalum Hull, which marks the end of their 105 Collection.

The UR-105 TTH –“TTH” stands for Tantalum Hull – is a limited edition of just 12 pieces. Its distinctive octagonal form features deep streaks along its entire length. It is angular, geometric, and symmetrical with strong influence from the Art Deco style.

URWERK UR-105 TTH (Tantalum Hull) Limited Edition

Activating the sliding “tongue” of the UR-105 TTH opens the hull to reveal its mechanics, featuring a satellite time indication built on a new skeleton carousel. The latter supports four hour satellites, each displaying three hour numerals that rotate in turn along the minute track, providing both analog and digital time displays.

URWERK UR-105 TTH (Tantalum Hull) Limited Edition


A power reserve indication and digital seconds complete the information on the dial. The digital seconds displaying the seconds in ten-second increments is particularly remarkable. To make it as light and as ephemeral as possible, the seconds disk was made using the LIGA photolithography process and the marker is open-worked. The total weight of the display is less than 0.10 grams.

URWERK UR-105 TTH (Tantalum Hull) Limited Edition

On the back, two turbines regulate the movement’s automatic winding system, which can be easily adjusted using a small lever according to how active the wearer is. In the “FULL” position, the slightest movement of the wrist is enough to wind the mainspring.

URWERK UR-105 TTH (Tantalum Hull) Limited Edition

In “STOP” mode, the automatic winding system is deactivated and the UR-105 is manually wound. A third intermediate position, “RED” (for REDUCED), moderates winding to minimize excessive tension and wear.

URWERK UR-105 TTH (Tantalum Hull) Limited Edition

Technical details

Model: UR-105 TTH (Tantalum Hull)

Limited edition of 12 pieces

Caliber UR 5.03, automatic winding regulated by twin turbines
Jewels: 52
Frequency: 28,800vph / 4Hz
Power reserve: 48 hours
Materials: Satellite hour Geneva crosses in beryllium bronze; skeletonized carrousel in aluminum; skeletonized nickel-phosphorus LIGA digital seconds; carrousel and triple mainplate in ARCAP

Perlage, bead blasting, frosting
Screw heads with polished bevels
Hours and minute indexes hand-painted with Super-LumiNova

Satellite hours; minutes, digital seconds
Power reserve

Material: UR-105 CT “soap bar” case in titanium and tantalum
Dimensions: Width: 39.5mm; length: 53mm; height: 17.8 mm
Crystal: Sapphire crystal
Water resistance: Pressure tested to 30m / 3ATM

Vulcarbon© rubber reference “Kiska” with black DLC buckle

CHF 77,000 (Swiss francs, excluding tax)