UR-210S “Full Metal Jacket”: The favorite child

January 30, 2015

“I really don’t think that I can do better,” emotionally explains Martin Frei, artistic director and co-founder of URWERK, as he presents the latest addition to the URWERK collection. “In my eyes the UR-210S is our most accomplished creation to date.”

Many already know the UR-210 for its orbital complication and imposing retrograde minute hand. However, this ‘S’ version – a limited edition of just 35 pieces – adds an even stronger monochrome aesthetic with its full metal bracelet, which was developed specifically for URWERK. The radical UR-210S is uncompromising – it will be love at first sight for aficionados of avant-garde horology.

Warning: The UR-210S is highly addictive.

• A double coaxial star-shaped cam regulates the retrograde mechanism through its gearing and its rotation defines the trajectory of the minute hand. When the minute hand reaches 60, the double star trips a (one of three) hockey stick shaped spring under the mechanism, which liberates the minute to fly back to the next hour satellite at 0-minutes.

The dial of the UR-210S features a traditional power reserve indication at one o’clock. In a near mirror image at 11 o’clock we find a similar indication. No, it isn’t a duplicate fail-safe, but something much more important which deserves our full attention, because it is actually a world-first complication that indicates winding efficiency over the last two hours.
Has your recent activity been enough to replenish your UR-210’s energy levels? If yes, the winding efficiency indicator will point emphatically to the green zone. If not, you have been using more energy than you are generating, and the winding efficiency indicator will point to the red zone.

Armed with knowledge of both winding efficiency and available power reserve, you are then able to intervene. If your UR-210 indicates an insufficient supply of energy, you can position the winding efficiency selector at the back of the watch to “FULL”.

The rotor will then convert the slightest movement into stored energy. In this configuration, a turbine connected to the rotor provides smooth, unimpeded power. But if you are more active, then that may provide more power than required and unnecessarily wear the mechanism. In that case, you would position the winding efficiency selector to “REDUCED” to engage the rotor damping system. An air turbine compressor mounted on ruby bearings spins and creates internal resistance – enough friction to slow down or dampen the automatic winding rotor. In “STOP” mode, the automatic winding system is disabled completely and the UR-210 runs off reserve power and may require manual winding.

UR-210S “Full Metal Jacket ” – Technical Specifications
Material Titanium and steel
Dimensions Width 43.8mm, length 53.6mm, thickness 17.8mm

Glasses Sapphire crystal
Water resistance 30m/100’/3ATM
Surface finishes
Strap: Satin finish; bead-blasted
Metal bracelet with deployment clasp developed by Maspoli for URWERK

Caliber UR-7.10
Jewels 51
Escapement Swiss lever
Balance Monometallic
Frequency 28,800v/h, 4Hz
Balance spring Flat
Power source Single mainspring barrel
Power reserve 39 hours
Winding system Self-winding coupled to turbines
Materials Plate in ARCAP P40 rhodium coated; 3D minute hand in aluminum with brass counterweight; central cylindrical spiral in spring-steel; hour satellites in aluminum; central carrousel and screws in Titanium Grade 5
Surface finishes Circular graining, sandblasted, circular and straight satin-finished plate; satin-finished and diamond-polished satellites; beveled and polished screw heads
Patented revolving satellite complication with wandering hour and three-dimensional retrograde minute hand; power reserve indicator; patented winding efficiency indicator
Super-LumiNova treatment on markers, dials, indexes, hands, and satellites

Two-position winding crown with crown protector
On the back: winding efficiency selector