The ETA 2878 is a reliable vintage automatic watch movement from the Swiss manufacturer ETA, introduced in the 1970s as part of the economical 2800 series. Known for its robustness and bilingual day-date complication, it powers numerous mid-range watches with precise timekeeping.
Key Specifications
Diameter: 25.6mm (11.5 lignes)
Thickness: 5.35-5.5mm
Jewels: 17/21/25 (depending on grade)
Beat Rate: 28,800 vph (4 Hz)
Power Reserve: ~38 hours
Lift Angle: 52 degrees
Features and Functions
This self-winding mechanical caliber includes central hours, minutes, sweeping seconds, and a quick-set day-date window at 3 o’clock, with instantaneous changeover at midnight. It supports hand-winding, features Incabloc shock protection, and a ball-bearing rotor for bi-directional winding. Hacking capability is optional via a stop lever (part 9433), allowing seconds-hand stop for precise setting.
Comparisons
Vs. ETA 2879: Higher beat rate (28,800 vs. 21,600 vph) for smoother sweep.
Siblings: Related to 2870/2872 (similar but varied jewels/functions); manual-wind counterpart is 2858.
Dial feet positions match modern ETA 2824-2, easing retrofits.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
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