Swatch Sistem51

The Sistem51 is an automatic movement introduced by Swatch in 2013, also known as the ETA C10.111. It contains 51 parts assembled by robots using a single central screw and operates at 21,600 vph with a 90-hour power reserve. The movement features a laser-adjusted escapement rather than a traditional regulator and has a bi-directional peripheral rotor visible through the caseback. It is non-serviceable and sealed. The Sistem51 remains in production and serves as the base for several Swatch Group brand watches.