| Brand: | ETA | 
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|---|---|---|---|
| Family: | |||
| Height: | 5.05 mm | ||
| Jewels: | 21 | ||
| Reserve: | hours | ||
| Frequency: | 21,600 A/h | ||
| Winding: | Automatic, Central Rotor Automatic Winding | ||
| Diameter: | 25.60 mm (11.5 ligne) | ||
| Complications: | Date, Day, Instant Date Change, Instant Day Change, Quick Date Correction | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 3:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Etachron Regulator |
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| Production: – | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 2846 was a cost-reduced version of ETA 2828 produced for Swatch but also offered to other manufacturers.