Designed for ladies watches and other small applications, the 2678 measures just 7¾ lignes (17.2 mm) in diameter and is 5.35 mm tall. It includes hour, minute, and second hands and both day and date wheels. The slightly thinner ETA 2671 is similar but omits the day wheel.
The movement is used for ladies' watches. It extends the ETA 2671 with a weekday display.