There are several features that set Urwerk watches apart from any other product of the luxury watch sector. The most obvious is of course Urwerk’s trademark satellite wandering-hours indication. Equally unmistakeable is the shape of the case with its imposing crown at 12 o’clock. The more perspective might also remark on the liberal use of SuperLuminova lighting up the indications on the dial. This is more than a creative whim by the brand’s creators; it harks back to the source of their inspiration: the 17th century night clocks made by the Campani brothers. According to the legend, the Pope ordered a special clock from the Campani brothers. It had to tell the time in the dark when he celebrated the divine offices at night. But the clock had to be silent so as not to disturb the Pope when he slept, while the time had to be immediately visible. The Campani brothers produced the so-called “wandering hour” clock in which the hands were replaced by hour numerals that successively traversed a scale of 60 minutes. The passing hours were illuminated from within the clock by a candle. Needless to say, many of these clocks, made largely of wood, caught fire, and the system fell into disuse. Thus one of the fundamental requirements of every Urwerk watch is to show the time clearly in the dark.
Luminosity is at the heart of Urwerk’s latest creation. Its name “Kryptonite” derives from the intense green light emitted from the hour markers, a very familiar name to Superman. In addition to its effect, the UR-105 CT “Kryptonite” offers a unique shape, a remarkable octagon with deep grooves along its length. The Art Deco influences are apparent in its geometric angularity and symmetry.
You have to slide the catch on the top of the case to reveal the mechanism of the UR-105 CT. It’s a wandering hour indication based on a new openwork carousel, which carries the four satellites, each bearing three numerals for the hours. The hours successively sweep past the minutes scale for an analogue and digital display of the time. A power-reserve indicator and digital seconds make up the rest of the information displayed on the dial. The digital seconds are remarkable in that they indicate tens of seconds. The mechanism was made using a photolithographic process, with each marker openworked to make it as light as possible. It thus weighs less than a tenth of a gram.
Two pneumatic turbines on the back govern the selfwinding rate, which can be set with a lever. In the FULL position, the slightest movement of the wrist is harnessed to rewind the barrel springs. Turn the lever to STOP to disengage the selfwinding system and wind up the UR-105 using the crown. If you are particularly active, select the intermediate position, RED (for reduced). This engages the turbines to dampen the winding rotor and avoid overstressing the mainspring.