The ETA 1101 Watch Movement: A Timeless Classic
The ETA 1101 is a manual-wind mechanical movement renowned for its reliability and precision, introduced around 1955 by ETA SA Manufacture Horlogère Suisse. This 12-ligne (26.60 mm diameter) caliber features a sweep seconds hand and exemplifies mid-20th-century Swiss horology, powering numerous vintage watches from brands like Zodiac and Leon.
Key Specifications
Size and Jewels: 12”’ diameter, 4.50 mm height; typically 15/17/19/21 jewels depending on grade.
Beat Rate: 18,000 A/h (5 Hz), ensuring smooth seconds sweep.
Power Reserve: Approximately 40-45 hours when fully wound.
Functions: Central hours, minutes, sweep seconds; no date complication.
Historical Context
Produced during ETA’s expansion era, the 1101 belongs to the 1100 family, related to calibers like 1100 and 1113. It was widely used in dress and tool watches of the 1950s-1970s, valued for robustness in daily wear. Variants included improved balances for better accuracy.
Technical Highlights
Manual Winding: Classic crown-winding via stem
Balance Staff: Compatible with NOS parts for 1100/1101 series, ideal for restorations.
Finishing: Entry-level to mid-grade finishes; higher versions feature blued screws and Geneva stripes.
Service and Availability
Today, ETA 1101 movements remain serviceable with parts from specialists, though Swatch Group restrictions limit new supplies. Collectors prize it for vintage repairs, with spares like balance staffs available online. Accuracy post-service often hits -10/+20 seconds/day.
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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