The Eterna Calibre 1025 stands as a pinnacle of mid-20th-century Swiss horology, cherished by vintage watch collectors and hobbyist watchmakers for its robust engineering and timeless reliability. Introduced in the 1950s, this manual-wind movement powered countless Eterna dress and tool watches, blending precision with elegant finishing that rewards meticulous servicing.
Historical Context
Debuted around 1954 as part of Eterna’s push into high-beat innovations, reflecting post-war advancements in balance design.
Featured in models like the Eterna-Matic series, often paired with clean dials and stainless steel or gold cases.
Known for its durability in daily wear, with many surviving examples still ticking after decades of use.
Technical Specifications
Type: Manual wind, sweep seconds.
Dimensions: Diameter 11.75 lignes (26.60 mm), height 4.85 mm—ideal for slim vintage cases.
Jewels: 21, including friction-reducing Incabloc shock protection.
Frequency: 19,800 vph (5.5 Hz), offering smoother seconds hand motion than standard 18,000 vph contemporaries.
Power reserve: Approximately 46 hours on full wind.
Balance: Glucydur with flat Nivarox hairspring for temperature stability.
Adjustments: Typically regulated in three positions for accuracy within +10/-5 seconds per day.
Key Features
Bi-directional mainspring barrel winding via efficient gear train, minimizing wear.
Clean, perlage-decorated bridges with signed rotors in automatic variants, though 1025 emphasizes manual finesse.
Quick-maintenance design: Easily accessible hairspring and pallet fork for hobbyist regulation.
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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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