ETA Caliber 2840
ETA Caliber 2840

ETA Caliber 2840

ManufacturerETA
Caliber Number2840
Movement TypeAutomatic, self-winding mechanical
Lignes11.5”’
Diameter
26mm
Casing Diameter
25.6mm
Height
4.7mm
Jewel Count
23
Beat Rate / Frequency
21,600 bph / 3 Hz
Lift Angle
50 degrees (unconfirmed)
Power Reserve
~38 hours
Rotor Style
Ball-bearing
Rotor Winding Direction
Bi-directional (reversers)
Hand-Windable?
Yes
Anti-Shock Device
Novodiac
Regulator?
None
Hand Count3
FunctionsCentral hours; central minutes; central sweeping seconds
Hacking Seconds?
No
Country of ManufactureSwitzerland, Swiss made (V8)
Known Models
(Add your watch to the comments below…)

The ETA caliber 2840 is a a vintage automatic watch movement that was meant to be an economy version of the 2800 family of movements, with some similarities to the framework of the famous 2824-2.

This caliber is found exclusively in Swatch watches from the 1990s (since circa 1991), which is why official technical documentation appears to be non-existent.

You may see this calibre described as being the no-date version of the 2842, however, there are 2842 movements without a date as well.

Additional Resources:

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