The ETA 2790-1 watch movement, in use since the 1960s, features an excenter regulator for the stud carrier and a patented double-excenter winding mechanism with jewelled rollers. It incorporates a jewel-bearing rotor and utilizes an intermediate wheel between the minute pinion and the rest of the train, enabling a large balance and low profile while maintaining durability. Additionally, its design allows for the placement of the seconds wheel in either the center or as a sub second without requiring significant modifications. This automatic movement also offers a sub-second function and a date feature that can be set by changing the time from 20:45 to 24h.