ETA was one of the premier automatic watch movement makers of the 1950's and 1960's, and were allowed by Ebauches SA to develop a modern, ultra-thin movement for the 1963 Eterna-Matic 3000. This movement, Cal. 1466U, featured many innovations, including a modular, one-plate design with the automatic winding works sunk into a depression at the center of the gear train. That movement was updated to become Cal. 1504, operating at 28,800 A/h.
As ETA emerged as the strongest movement maker for the entire Swiss watch industry during the quartz crisis, Cal. 1504 was updated to become Cal. 2890 and, with quickset date, Cal. 2892. Like their Eterna predecessors, they use a ball-bearing rotor and feature efficient "Eterna" gears for a power reserve of 42 hours.