The ETA 2770 is a classic automatic mechanical watch movement from the Swiss manufacturer ETA, renowned for its reliability in mid-range timepieces. Produced from 1969 to 1982, it belongs to a family of over 25 million units, emphasizing ETA’s dominance in affordable Swiss horology.
Key Specifications
Diameter and Jewels: 11.5 lignes (25.6 mm), with 17, 21, or 25 jewels depending on variant.
Beat Rate: 21,600 A/h (vibrations per hour), offering a 48-hour power reserve.
Height: 5.3 mm for base model, slimmer at 5.2 mm in some quickset versions.
Functions: Sweep seconds; paired with hand-wound ETA 2750.
Family Variants
This movement spawned numerous siblings for diverse complications:
ETA 2772: Adds date window.
ETA 2773: Date with Triovis regulator for precision.
ETA 2781/2782: Quickset date.
Day/date options like 2778/2788, up to 6.0 mm thick.
High-beat 28,800 A/h models (e.g., 2771, 2774) provided 45-hour reserve for smoother seconds.
Historical Significance
Introduced during ETA’s expansion era, the 2770 powered brands like Omega and Tissot, bridging vintage reliability with modern serviceability. Its robust design suits restoration projects, with ample spare parts availability today. Though succeeded by ETA 28xx series, it remains a benchmark for entry-level automatics.
Servicing Notes
Routine maintenance involves demagnetization and lubrication every 5-7 years. Common issues include worn date wheels in complicated variants, fixable with ETA spares. Collectors value its workhorse status in 1970s divers and dress watches.
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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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