ETA SA 2878

The ETA 2878 is an automatic movement manufactured by ETA SA and belongs to the ETA 2800 series. It operates at 28,800 vph with Incabloc shock protection and a ball-bearing rotor with bi-directional automatic winding. The movement features a day and date calendar with quickset and instantaneous changeover at midnight. Notably, it was originally sold as a non-hacking movement, with the hacking function available as an optional add-on part. Jewel count varies between 17, 21, or 25 jewels depending on the version. This movement was produced from the 1970s as a more economical alternative within the ETA lineup.