The Eterna 12678 stands as a hallmark of 1970s Swiss engineering, captivating vintage watch enthusiasts and hobbyist watchmakers with its robust automatic design based on the ETA 2678. Launched around 1970, this caliber powered countless Eterna timepieces during an era of innovation in self-winding movements, blending reliability with practical complications like day-date displays.
Historical Context
Eterna, a storied Swiss maison founded in 1856, refined the ETA 2678 into the 12678 to enhance its vintage dress and sports watches. Collectors prize it for its slim profile and smooth sweep second hand, evoking the golden age of mechanical horology before quartz dominance. Hobbyists often restore these calibers, sourcing parts from specialist suppliers due to their enduring serviceability.
Technical Specifications
Type: Automatic self-winding with sweep second hand
Base Caliber: ETA 2678
Size: 7 3/4 lignes (17.2 mm diameter); height 5.35 mm
Jewels: 21 functional (25 total)
Frequency: 28,800 beats per hour (4 Hz)
Complications: Day (quickset), date (quickset)
Power Reserve: Approximately 40-45 hours
Rotor: Bidirectional winding
Balance: Glucydur with Breguet overcoil hairspring
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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