The Eterna 1425 stands as a pinnacle of mid-20th-century Swiss horology, part of the innovative Eterna-Matic 1400 family introduced in 1953. This automatic movement captivated vintage enthusiasts with its slim profile and pioneering ball-bearing rotor, offering reliable self-winding in an era of mechanical refinement.
Historical Context
Eterna revolutionized automatics in 1948 with the original Eterna-Matic’s five-ball-bearing rotor, evolving it into the slimmer 1400 series by 1955. The 1425 variant, typically a date-equipped caliber, powered elegant dress watches during the 1950s and early 1960s. Hobbyists prize it for serviceability and the “fit-and-forget” efficiency from its bi-directional Eterniflex mainspring.
Technical Specifications
Diameter: 11.5 lignes (25.6 mm)
Height: 5.55 mm (non-date) or 5.85 mm (with date)
Jewels: 17–21
Frequency: 18,000 vph (5 Hz)
Power Reserve: Approximately 48 hours
Balance: Glucydur, screwed, with flat Nivarox hairspring
Shock Protection: Eterna-U system
Winding: Bi-directional rotor on 5 x 0.65 mm ball bearings, double-click mechanism
Functions: Center seconds, date window (gradual change around midnight)
Beat Rate: Consistent 2.5 Hz for smooth sweeping seconds
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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