Eterna 1421: A Vintage Automatic Gem
The Eterna 1421 calibre, launched around 1953, captivates vintage watch enthusiasts and hobbyist watchmakers with its compact automatic design and reliable performance. Part of Eterna’s esteemed 1400 series, this 11.5 ligne movement powered mid-century dress watches, blending Swiss precision with innovative self-winding tech. Its domed dial compatibility and quickset date made it a favorite for elegant timepieces from the 1950s and 1960s.
Historical Context
Introduced during Eterna’s post-war expansion, the 1421 evolved from earlier manual-wind models like the 1411, adding automatic winding via a bidirectional rotor. Hobbyists prize it for serviceability—parts remain available through specialists—and its role in Eterna-matic lines. Collectors seek it in original cases for its smooth sweep seconds and 48-hour power reserve, ideal for daily wear or restoration projects.
Technical Specifications
Type: Automatic, self-winding with sweep seconds and date (quickset via repeated crown pulls)
Dimensions: 11.5 lignes (25.6 mm diameter), height 5.85 mm
Jewels: 17
Beat rate: 18,000 A/h (5 Hz)
Power reserve: 48 hours
Frequency: Standard rotor winding, shock-resistant (Incabloc or similar)
Functions: Hours, minutes, central seconds, date at 3 o’clock
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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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