Source

Source comes in two versions: Source Aleph and Source Ribbon , both powered by the new double micro rotor movement EB 21L, which gives ample and stable power supply.
The double rotor movement EB21L – at only 4.76 millimetres thin – solves an ever-present challenge in watchmaking. How do you make sure the time-measuring part of the movement remains efficient when you have power-consuming complications? This solution not only solves a problem, as the timekeeping’s power supplied is not interfered with by the complication, but it will also allow for future complication developments that until now were impossible.