The Eterna calibre 852 is a hand-wound workhorse that quietly underpins some of the most characterful mid-century Eterna watches, from civilian “jumbo” pieces to Czech Air Force pilot’s watches. It rewards both vintage collectors and hobbyist watchmakers with robust engineering and generous proportions.
Technical specifications
Manual-wind movement, Eterna in-house calibre 852 (variants 852S with sub‑seconds, 852C with central seconds).
Approximate diameter: 14 lignes, just under 32 mm, giving it a broad, “full‑plate” presence in the case.
Frequency: 18,000 vibrations per hour, with a leisurely beat that eases regulation and visual timing by eye.
Jewel count: 15 functional jewels, reflecting a focus on robustness over decorative complication.
Power reserve: roughly 50 hours from a full wind, unusually comfortable for a 1940s–50s manual calibre.
Appeal for vintage enthusiasts
Generous movement size translates into 35–37 mm steel cases that wear with real wrist presence by 1940s standards.
Often found with beautifully aged radium dials—black “military” aesthetics or creamy silver dials with rich patina.
Historical interest thanks to documented use in Czech Air Force “Majetek” pilot’s watches.
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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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