The ETA 2791 is a compact automatic watch movement from ETA’s 2700 series, prized for its reliability in vintage and modern timepieces. Known for slim design and practical features, it powers numerous Swiss watches with precise timekeeping.
Key Specifications
Size and Build: 11.5 ligne (25.6mm diameter), 4.1mm height, 17 or 21 jewels depending on variant.
Frequency: 28,800 vph (4 Hz), offering smooth sweep seconds.
Power Reserve: Approximately 42 hours.
Functions: Hours, minutes, central seconds, date at 3 o’clock with quickset.
Features and Performance
This movement includes an automatic bidirectional rotor for self-winding and optional hacking seconds for precise setting. Its slim profile suits thinner cases, comparable to day/date models in height. Robust construction ensures durability, with Incabloc shock protection in many versions.
Historical Context
Introduced in the 1970s as part of ETA’s workhorse 2800/2900 family evolution, the 2791 remains in demand for repairs and custom builds. It underpins brands like Tissot and Omega in entry-level automatics.
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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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