The ETA 838 is a mechanical watch movement that was produced from 1959 to 1990. It is closely based on the AS 1475 movement and underwent some changes over time. Early samples featured a monometallic screw balance, Breguet hairspring, and a fixed stud carrier, while late samples featured a ring balance, flat hairspring, and a mobile stud carrier. Additionally, the ETA 838 movement includes functions such as manual-wind alarm, sweep second, and an alarm function.