The ETA 2850 is a reliable manual-wind mechanical movement from ETA, known for its precision in vintage and dress watches.
Overview
Produced by ETA SA Manufacture Horlogère Suisse, the 2850 belongs to the workhorse family of Swiss ebauches, emphasizing slim design and smooth operation. It features a sweep seconds hand for fluid timekeeping and typically includes 17 jewels to reduce friction. This caliber powered numerous mid-range watches from the 1970s onward, valued by collectors for serviceability.
Key Specifications
Diameter: 25.6 mm (11.5 lignes), fitting standard 38-42 mm cases
Height: Approximately 4.3 mm, enabling thin profiles
Frequency: 28,800 vibrations per hour (4 Hz) for accurate sweeping
Power Reserve: Around 50 hours when fully wound
Jewels: 17 standard, supporting longevity
Winding: Manual via crown; optional hacking for precise setting
Features and Reliability
The movement uses a Glucydur balance and Breguet hairspring for stability against shocks and positions. Its straightforward construction aids repairs, with parts widely available for vintage restorations. Variants may include date complications, though base models prioritize simplicity.
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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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