Urwerk UR-105 TTH
Urwerk UR-105 TTH


Urwerk Finishes the UR-105 CT on a Strong Note

“At Urwerk, we took radical decisions very early on: deciding to remain independent at all costs and limiting our growth despite all the advice to the contrary were among the most important. To continue staying true to ourselves, to remain Urwerk, we make less than 150 pieces per year. This means that we reluctantly have to ‘kill’ a collection to bring a new creation to life. And time for the UR-105 CT is now running out,” explains Urwerk co-founder Felix Baumgartner.

The new Tantalum Hull is the last edition of the UR-105 CT and ends the 105 collection in style.

Urwerk UR-105 TTH wrist

Presenting the UR-105 TTH

“Tantalum is a very special metal. Its name comes from Tantalus, one of Greek mythology’s bad boys. Tantalum is precious, rare, and extremely painful to machine and finish. We made a UR-110 out of tantalum a few years ago – a first that almost was the last. The team made me promise never to use it again because tantalum ‘eats’ our CNC machines’ bits. It destroys them, reducing their life by a factor of three. But I love its blue-gray luster. Pure magic!” co-founder Martin Frei says.
Urwerk UR-105 TTH open

Fortunately, as so often with Urwerk, desire won over reason. 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,” confides Felix Baumgartner.

One Hull of a Watch

The UR-105 TTH – “TTH” stands for Tantalum Hull – is a beautiful object, substantial and pleasing to hold. 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.

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.”

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.

Power Control

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 created 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 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. 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 caseback

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