The Eterna 1020S calibre stands as a testament to Swiss precision from the WWII era, captivating vintage watch lovers and hobbyist watchmakers with its robust manual-wind design. Produced around the 1940s, this movement powered military-grade timepieces like the Eterna Birks Challenger, blending reliability with understated elegance. Its small seconds sub-dial and lever escapement make it a favorite for restoration projects.
Historical Context
Emerged in the early 1940s amid wartime demands for durable, legible watches.
Featured in steel-cased military models with screw-down backs for enhanced water resistance.
Shares design lineage with later Eterna calibres like the 1020 and 2203, emphasizing compact engineering.
Technical Specifications
Type: Manual wind, lever escapement.
Jewels: 16-17, reducing friction in key pivots.
Frequency: 18,000 beats per hour (BPH) for smooth operation.
Dimensions: Approximately 11.75 ligne (26mm diameter), 4.5-5mm height.
Functions: Hours, minutes, small seconds at 6 o’clock.
Balance: Compensation balance for temperature stability.
Power reserve: Around 40-45 hours.
Finishing: Efficient bridges and plates, often with Geneva stripes in higher grades.
Appeal for Hobbyists
Straightforward disassembly suits beginner servicing; shock protection on balance staff.
Readily available parts from vintage suppliers aid overhauls.
Non-sweep seconds variant offers clean, military aesthetic.
Pairs well with two-tone dials and acrylic crystals in period restorations.
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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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