Eterna Calibre 12804: A Vintage Powerhouse
The Eterna Calibre 12804 stands as a pinnacle of 1970s Swiss engineering, powering iconic Eterna-Matic watches prized by vintage enthusiasts and hobbyist watchmakers. Derived from the robust ETA 2824 architecture, this automatic movement delivers reliable performance with smooth sweeping seconds, making it ideal for restoration projects and daily wearers.
Historical Context
Introduced around 1972, it marked Eterna’s resurgence, building on their 1948 ball-bearing rotor innovation for frictionless winding.
Often inscribed with “Eterna-Matic” and “Brevet Swiss,” it appeared in stainless steel divers and dress watches from the era.
Known for durability, these movements powered reintroduced models blending vintage charm with modern usability.
Technical Specifications
Type: Automatic mechanical with date complication.
Frequency: 28,800 vibrations per hour (vph), 4 Hz beat rate.
Jewels: 25 high-quality bearings.
Diameter: 25.6 mm (11.5 lignes).
Height: Approximately 4.6 mm.
Power reserve: 38 hours when fully wound.
Rotor: Bidirectional, ball-bearing equipped for efficient self-winding.
Functions: Hours, minutes, central seconds, date at 3 o’clock.
Shock protection: Proprietary Eterna system.
Adjustments: Typically 3 positions for precision.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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