Urwerk UR-105 T-Rex

Would you want to meet this thing on a dark night, or in a tropical jungle? It’s name is menacing enough, T-Rex, and that spiky carapace looks threatening to say the least. The top of the case is in hand-finished bronze, and the crown at the top is also magnificently aggressive. Even when new, the watch’s appearance looks aged, with the hand-patinated surface suggesting a mature leathery dinosaur skin. It will continue to develop organically as the watch travels through time and space.

Urwerk UR-105 T-Rex

The UR-105 T-Rex by Urwerk is a new version of the existing UR-105 with its characteristic wandering hours display of time, with four rotating discs, each with three numerals, showing the hours. Minutes are shown by the position of the hour numeral as it sweeps along the scale from right to left. Hour and minute markers are coated in SuperLuminova for visibility at low light levels. The main case and caseback are in PVD-coated titanium. Water-resistance is the standard 3 bar, 30 metres depth of water. The watch is large at 39.5 mm width, 53 mm length and 16.8 mm thickness.

Urwerk UR-105 T-Rex movement

The caseback reveals one of Urwerk’s most interesting innovations, the two miniature turbines that rewind the mainspring using the user’s own movements. The rate at which energy is transferred to the mainspring can be adjusted using the lever. In the Stop position, the automatic winding system is deactivated so that the UR-105 can be hand-wound using the crown. The “Red” setting is for reduced-speed automatic winding, that avoids excessive tension in the mainspring. The Full position ensures that even the slightest movements transfer energy to the mainspring.

Urwerk UR-105 T-Rex caseback

The base movement for this watch is made by Girard-Perregaux or Zenith, and the extra stuff – satellite hours, double turbines for automatic winding – is made and assembled in-house by Urwerk. The entire movement is called the Calibre 5.02 UR. It runs at 28,800 vibrations per hour, 4 Hertz, and has a power reserve of 48 hours.


The UR-105 T-Rex is a limited edition of 22 pieces, costing 65,000 Swiss francs.

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