The ETA 2640 is a compact, manual-wind mechanical movement from ETA SA, renowned for its reliability in ladies’ watches. Produced primarily from the 1970s to 1980s, it exemplifies Swiss horological precision with a small footprint ideal for slim cases.
Key Specifications
Size and Dimensions: 7.75 lignes (17.5mm diameter, 3.5mm height), perfect for petite timepieces.
Frequency: 21,600 beats per hour (3 Hz), balancing smoothness and longevity.
Jewels: 17, reducing friction in critical pivots.
Power Reserve: Approximately 40-48 hours when fully wound.
Functions: Central hours, minutes, and seconds; sweep seconds hand.
Design and Features
This hand-wound caliber features an Incabloc anti-shock system for durability and a 53-degree lift angle for efficient energy transfer. Parts like the balance (721/2007) interchange with family members such as 2641 or 2650, aiding repairs. Compared to the higher-beat 2660 (28,800 bph), the 2640 prioritizes a slimmer profile over faster motion.
History and Usage
Introduced in the 1970s, the ETA 2640 powered vintage ladies’ models from brands like Omega and Tissot, though specific watches vary. Its manual winding appeals to purists, avoiding battery dependency. Spare parts remain available via specialists, supporting ongoing servicing.
Service Considerations
Routine maintenance every 4-5 years ensures accuracy within -10/+20 seconds daily. Enthusiasts value its robustness, with NOS components cross-compatible across 26XX series—always verify with suppliers. This movement underscores ETA’s legacy in accessible, high-quality horology.
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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