After separation, the blocks in the clock rotate around their axis, close, again forming a satellite, and display the next hour. To force the satellites to open simultaneously with the rotation of their component blocks, a special lyre spring was made for the Urwerk UR-120 Spock. The UR-120 also has improved legibility, with the hour markers 35% larger than the UR-110 thanks to the satellite block mechanism.
The movement of the satellites is controlled by the UR-20.01 movement with automatic winding. A window in the case back reveals the Windfänger, a star-shaped detail that regulates the intensity of the caliber's self-winding movement.
The UR-120 comes in a matte gray version with sandblasted steel for the body and bezel and titanium for the bottom. The two parts of the case are connected by side screws. The UR-120 features hinged lugs and a calfskin Cordura textured strap instead of a fabric strap.
Case size - 47 x 44 x 15,8 mm. In the Urwerk UR-120 Spock, it is especially ergonomic: the upper part of the case is absolutely smooth, without screws or connectors.
