The ETA 843 is a mechanical watch movement that features an indirect minute hand friction clutch on the barrel. It incorporates a stem mechanism without a setting-lever spring. There are variants available with or without a separate barrel bridge. The movement offers several functions, including manual winding, a sweep second hand, and a date feature that can be adjusted by changing the time from 21:40 to 24 hours. It was commonly used during the period around 1975.