The Eterna 833 calibre represents a pinnacle of mid-20th-century Swiss horology, cherished by vintage watch enthusiasts for its robust bumper automatic design. Produced from the 1940s through the 1960s, this movement powered iconic military and civilian models, blending reliability with elegant engineering that hobbyist watchmakers still restore today.
Historical Context
Emerged post-WWII as Eterna refined ebauche movements like the base 905, introducing bumper auto-winding for enhanced daily usability.
Featured in rugged stainless steel military watches, prized for shock resistance and legibility in demanding conditions.
Transitioned from manual to automatic winding trends, bridging eras before rotor-based automatics dominated.
Technical Specifications
Type: Automatic with bumper winding mechanism (hammer-style rotor bounces between springs).
Jewels: 17 jewels, reducing friction in key pivots.
Functions: Sweep seconds hand; three hands total (hours, minutes, central seconds).
Frequency: 18,000 vibrations per hour (2.5 Hz), balancing smoothness and longevity.
Power reserve: Approximately 40-45 hours when fully wound.
Dimensions: 11.75 lignes (26.2 mm diameter), 4.6 mm height—compact for vintage cases.
Escapement: Swiss lever, fork and pallet design for precision.
Balance: Glucydur alloy with Breguet overcoil hairspring for temperature stability.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
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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