Eterna Caliber 834: A Vintage Bumper Automatic Gem
The Eterna 834 stands as a pinnacle of mid-20th-century Swiss horology, captivating vintage watch enthusiasts and hobbyist watchmakers with its innovative bumper automatic winding system. Produced around 1970 and rooted in the earlier Cal. 905 base, this movement exemplifies Eterna’s pioneering spirit in self-winding technology, first explored in their landmark Cal. 835 family from 1939.
Historical Context
Emerged during Eterna’s post-war innovation phase, building on bevel-edged base plates and compact designs from the 1930s-1940s.
Featured in military-style and dress watches, prized for reliability in everyday wear.
Bumper system uses a pivoting weight that “bumps” against springs, providing efficient winding without a full rotor—ideal for slimmer cases.
Technical Specifications
Size: 11.75 lignes (26.5mm diameter), 10.5mm height.
Functions: Sweep seconds at 9 o’clock sub-dial, automatic winding via bumper.
Jewels: 26-28, including cap jewels for balance and escape wheel.
Frequency: 18,000 vph (2.5 Hz), with Incabloc or ordinary shock protection options.
Power reserve: Approximately 40-45 hours.
Parts highlights: Stainless steel gears (center, third, fourth wheels), oscillating weight with axle and pinion, ratchet wheel for winding efficiency.
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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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