The four hour-satellites of the UR-103 are crafted in aluminium and are suspended under a grade-2 titanium orbital cross. The complication is mounted on a non-magnetic ARCAP P40 base plate providing superior strength and stability to traditional metals. The hour satellites completes a full revolution under the orbital cross every four hours. As the satellite approaches the crown position an internal Geneva cross causes it to undergo a 120 degree rotation on its own axis. This 120-degree rotation positions the next hour for its turn indicating the time at the front of the dial. Over a one-year time span each orbital cross completes 2190 rotations and each satellite makes 730 revolutions on its axis. Urwerks integration of a Control Board on the back of the 103 was a world first for a wristwatch.