The Eterna 12825 stands as a hallmark of 1970s Swiss horology, an automatic caliber derived from the ETA 2824 base, cherished by vintage enthusiasts for its reliability and smooth operation in classic dress and diver watches.
Historical Context
Developed by Eterna in 1975 as part of the 12800 family, evolving from manual-wind 12801 models.
Joint project roots trace to 1960s collaborations with brands like Doxa, Eberhard, and Zodiac, emphasizing bidirectional winding innovation.
Featured Eterna-Matic branding, highlighting self-winding with ball-bearing rotors for reduced friction—pioneering “fit-and-forget” durability.
Technical Specifications
Diameter: 25.6 mm (11.5 lignes).
Height: 4.6 mm.
Jewels: 25.
Frequency: 28,800 vph (4 Hz) for fluid sweep seconds.
Power reserve: Approximately 38-42 hours.
Functions: Hours, minutes, central sweep seconds, date at 3 o’clock (quickset via crown).
Winding: Bidirectional automatic rotor with two roller freewheels; manual wind capable.
Regulation: Free-sprung Glucydur balance, Nivarox hairspring, Eterna-U shock protection.
Hack: Yes, seconds stop for precise time-setting.
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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