The Junghans 650.00 is a mechanical watch movement with an open face calibre. It features a Breguet hairspring. It is speculated that this movement may also have been used in Junghans watches, but further information is currently unknown. This movement is designed for stem winding and setting and includes a sub-second function. Additionally, it has a hack feature. The Junghans 650.00 movement was used during the period from 1928 onwards.