Swatch SISTEM51

The Sistem51 is an automatic movement manufactured by Swatch, based on the ETA C10.111. It operates at 21,600 vph with a 90-hour power reserve and contains 51 parts assembled entirely by machines, featuring a single central screw. The movement uses a Nivachron hairspring for anti-magnetic properties and is housed in an ARCAP alloy. Introduced in 2013, it remains in production and is considered disposable rather than serviceable due to its hermetically sealed, laser-regulated design.