The new UR-105 Tantalum Hull is the last edition of the UR-105 CT and ends URWERK‘s 105 collection. The UR-105 TTH is a limited edition of just 12 pieces.
Tantalum is a precious metal weighing approximately the same as platinum. It has a solid presence on the wrist. To machine it is a nightmare, but it has incomparable beauty. Tantalum is one of the most URWERK-ian metals I know of. It is dark, almost anthracite colored, a shade which is an integral part of URWERK’s aesthetic signature. Felix Baumgartner
The UR-105 Tantalum Hull watch is characterized by an octagonal form that features deep streaks along its entire length. It is angular, geometric, and symmetrical with strong influence from the Art Deco style. Co-founder and chief designer of URWERK Martin Frei explains, “The UR-105 TTH comes with a protective cover, a breastplate that protects the mechanism. Tantalum is a perfect protective shield against corrosion. Hence its name Tantalum Hull.”
The sliding “tongue” of the UR-105 TTH opens the hull that houses its mechanics, including a satellite time indication built on a new skeleton carousel. The latter supports four hour satellites, each displaying three hour numerals that go around in turn along the minute track, providing both analog and digital time displays.
A power reserve indication and digital seconds complete the information on the dial. The lightweight seconds disk was made using the LIGA photolithography process and the marker is openworked. The total weight of the display is less than 0.10 grams.
On the back, two turbines control the movement’s automatic winding system, which can be adjusted using a small lever according to how active the wearer is. In the “FULL” position, the movement of the wrist can wind the mainspring. 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.