The Eterna Caliber 1137 stands as a pinnacle of mid-20th-century Swiss horology, captivating vintage watch enthusiasts and hobbyist watchmakers with its robust engineering and timeless reliability.
Historical Context
Introduced in the 1950s, the Eterna 1137 emerged during the brand’s golden era of automatic movements, building on innovations like the Eterna-matic rotor system. Crafted in Granville, Switzerland, it powered elegant dress watches and early sports models, embodying post-war precision. Collectors prize its scarcity today, often found in restored pieces from the 1950s-1960s.
Design Highlights
Ball-bearing mounted bidirectional rotor for whisper-quiet, efficient winding via the patented Eterniflex mainspring.
Clean, open architecture with perlage-decorated bridges and a prominent, polished oscillating weight dominating the view.
Glucydur screwed balance paired with a flat Nivarox hairspring, ensuring stability under daily wear.
Proprietary Eterna-U shock protection, a hallmark of the brand’s durability focus.
Technical Specifications
Size: 11.5 lignes (approximately 25.6mm diameter), 5.9mm height.
Jewels: 25-27 (depending on variant).
Frequency: 18,000 vibrations per hour (vph), 2.5 Hz.
Functions: Hours, minutes, center seconds; optional date window.
Power Reserve: Approximately 40-45 hours after full wind.
Winding: Automatic self-winder with manual capability; no hacking seconds.
Beat Rate Regulator: Fine adjustment via movable studs.
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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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