The ETA 2670 watch movement is a mechanical movement that features an automatic mechanism developed by Doxa, Eberhard, Favre-Leuba, Girard-Perregaux, and Zodiac. Based on the manual wind calibre AS 1687/1688, it includes functions such as automatic winding, sweep seconds, a 24-hour display, quickset date adjustment, a hack feature, and an adjustable stud holder. This movement was predominantly used during the approximate period of 1970.