Cal. 2890 (and similar Cal. 2892) is an ultra-thin automatic watch movement produced by ETA from 1975 to 1983. It was replaced by ETA 2892-2.

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.

Cal. 2890/2892 remained at 12.5 ligne (28 mm) like its predecessors, but it was replaced in 1983 by the narrower 11.5 ligne ETA 2892-2, predecessor of today's ETA 2892A2.

• Soprod 9094 - with day dial, power reserve indicator, and retrograde date indicator

• Eterna 1504, the predecessor movement
• ETA 2892-2, the successor movement