The ETA 2781 is a reliable automatic watch movement from the ETA 2770 family, produced between 1969 and 1982. Known for its quickset date function, it powered numerous vintage timepieces during its era. This article explores its key features and legacy in horology.
Technical Specifications
Diameter: 11.5 lignes (25.6 mm), fitting standard case sizes.
Height: 5.9 mm, allowing slim profiles in dress watches.
Jewels: 17, 21, or 25, reducing friction for longevity.
Frequency: 21,600 vibrations per hour (vph), balancing accuracy and durability.
Power Reserve: Approximately 47-48 hours when fully wound.
Lift Angle: 52 degrees, optimizing balance wheel performance.
Design and Functions
The ETA 2781 features bidirectional automatic winding via a rotor, paired with a manual hand-winding option through its corresponding ETA 2761 base. Its standout quickset date mechanism simplifies adjustments, a boon for daily wearers. Shock protection (Incabloc or similar) safeguards the balance during impacts, while the Triovis regulator option in variants enhances precision.
Historical Context
Part of ETA’s prolific 2770 series—over 25 million units made—this movement emphasized affordability and serviceability amid the quartz crisis. It appeared in brands like Omega and Tissot, often in mid-range automatics. Production ended in 1982, but NOS examples remain available for restorers.
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Stem, Crown, Hands & Spares might be available for this movement.
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