Eterna Calibre 1033: A Vintage Automatic Gem
Vintage watch enthusiasts and hobbyist watchmakers cherish the Eterna Calibre 1033 for its pioneering role in early automatic movements. Launched around 1941 as part of Eterna’s innovative 103x family, this self-winding calibre powered elegant dress watches during the post-war era, blending reliability with compact engineering. Its robust construction makes it a favorite for restoration projects, offering smooth sweeping seconds without manual winding.
Historical Context
Introduced in the 1940s amid Switzerland’s automatic movement boom, following Eterna’s earlier Calibre 1031 manual version.
Related to Calibre 1034, sharing a 9.75 ligne (22.4mm diameter) footprint ideal for slim cases.
Featured in Eterna models and third-party watches, prized for durability in daily wear.
Technical Specifications
Size: 9.75 lignes (diameter ~22.4mm), height approximately 5.35mm.
Type: Automatic self-winding with central rotor.
Jewels: 21 or 25, reducing friction in key pivots.
Frequency: 28,800 beats per hour (A/h or vph) for smooth operation.
Functions: Hours, minutes, sweep seconds; some variants include quickset date.
Power reserve: Around 40-45 hours, typical for era’s single-barrel design.
Shock protection: Incabloc or similar system in later evolutions.
Finish: Nickel-plated bridges, Geneva stripes on select examples.
Appeal for Enthusiasts
Restoration ease: Readily available parts like rotors and stems; straightforward disassembly for cleaning.
Service tips: Check rotor winding efficiency and balance poise; regulate via hairspring for +5/-10s/day accuracy.
Collector value: Pristine examples fetch premiums due to scarcity; pairs well with 1940s Eterna cases.
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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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