ETA 2661 is a compact, high‑beat manual-wind movement from ETA’s 2640 family, widely used in vintage ladies’ watches. It combines small diameter with robust performance and a practical date function.
Key specifications
Manual-wind mechanical movement
Diameter about 7.75 lignes (≈17.5 mm), thickness around 3.5 mm
High-beat rate of 28,800 vibrations per hour for improved stability and smoother seconds
Power reserve approximately 45 hours when fully wound
17‑jewel construction to reduce friction and wear in critical pivot points
Date display, typically at 3 o’clock, with quick indication change around midnight
Design and construction
Part of the ETA 2640 series, developed as a compact family derived from earlier Eterna designs and optimized for small cases.
Built with a conventional Swiss lever escapement and flat balance spring, prioritizing reliability and ease of regulation.
Layout favors serviceability: clearly defined gear train, accessible keyless works, and straightforward date mechanism, all helpful during overhaul and adjustment.
Use in watches and service notes
Commonly found in vintage and neo‑vintage ladies’ dress watches from various brands that sourced ébauches from ETA.
Suits thin, elegant cases thanks to its modest thickness and small diameter, without sacrificing beat rate or autonomy.
Watchmakers typically note good parts availability within the broader 2640 family, but original cosmetic components (dials, hands, branded rotors where applicable) can be more brand‑specific and harder to source.
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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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