The Junghans 686.70 watch movement is a manual/automatic movement with a relatively big balance and low profile. It offers various functionalities including manual wind, sweep second, day and date features. The day function is set by changing from 20.40-24h, while the date can be quickly set by repeated pulling of the crown. This movement was utilized around the period of 1965. It should be noted that there are other variations of the Forster movement, each offering different functionalities.