Urwerk is best known for their now-iconic satellite system, with spinning hour indicators integrated into a retrograde minutes display. This architecture is still there in the UR-210, but amped up a little. The minute hand is a three-dimensional cage inspired by the beak of the Maltese Falcon (which is what the Urwerk guys call the UR-210), and completely engulfs the hour satellite during it’s movement along the 120 degree arc. The hand looks monstrous (in the best way), but is 3-micron tolerance milled aluminum and weighs in at a super-light .302g. Utilizing a central spring and ruby bearing system, the flyback takes only .1 seconds at the change of each hour. At 1 o’clock is a traditional indicator for the 39 hour power reserve.
Now for the real star of the show. Opposite the power reserve, at 11 o’clock, is the world-first winding efficiency indicator. The appearance is simple enough, with a single hand drifting between the green (+) and red (-) ends of a curved scale. You might mistake it for a power reserve if you didn’t know any better, but what this scale actually measures is the difference between the energy consumed and generated by the mainspring over a two hour period. For you other nerds out there, it’s like the derivative of the power reserve indicator.