Urwerk UR-110 watches

The Urwerk UR-110, nicknamed the Torpedo, is a satellite-hour watch that was first seen in January 2011 as the successor to the UR-103. Its titanium case measures 47 by 51 mm and 16 mm high, with flanks that stick out like wings; one early review described it as a modified UR-103 case with wings. Urwerk now files it among its historical pieces.

The time is always read on the right side. Three hour satellites run on planetary gears around a central carousel, and each hour module counter-rotates against the carousel's direction, so the hours always face forward as they take turns passing the minute scale. A control board carries small seconds, a day/night disc and an "Oil Change" indicator that shows when the watch is due for a service and is reset to zero after it. Inside is the self-winding UR-9.01, whose rotor is coupled to twin turbines visible on the back; it runs at 4 Hz with 39 hours of reserve from a single barrel. The crown sits under a protective lid that lifts for setting, and the case is pressure tested to 3 ATM.

The UR-110 RG combines titanium with red gold. The Eastwood pieces, reported as the final UR-110, replace the face plate with wood curved to follow the crystal: Macassar ebony, dense and dark brown, or Red Ebony, with a burnt-orange hue. Each came in a run of 55 with three tweed straps colour-matched to its wood.

The UR-210 is a separate model in titanium and steel. Its hours also ride satellites, but an oversized three-dimensional retrograde minute hand sweeps the scale and flies back to meet the next hour satellite in under a tenth of a second. A winding efficiency indicator compares the energy used with the energy generated over the previous two hours, and a winding efficiency selector sits on the back. It runs on the self-winding UR-7.10, whose rotor is also coupled to turbines, with 39 hours of reserve.