ETA SA C07.611

The C07.611 is an automatic movement manufactured by ETA SA and part of the C07 family. It is based on the C07.111 and features an 80-hour power reserve and a Nivachron balance spring, which provides improved resistance to magnetic fields compared to conventional balance springs. The movement has a higher-grade finish than the base C07.111. It remains in production and is marketed as the Powermatic 80.611.