The ETA 1100 Watch Movement: A Vintage Classic
The ETA 1100 is a manual-wind mechanical movement from the mid-20th century, renowned for its reliability and innovative calendar features in an era dominated by simpler calibers. Produced by ETA SA, part of the Swatch Group, it powered numerous vintage watches from brands like Atlantic, Technos, and Breitling during the 1950s.
Key Specifications
Type: Manual wind with sweep seconds hand; 17 jewels.
Dimensions: Approximately 11.75 ligne (26mm diameter), slim profile for dress watches.
Frequency: 18,000 vph (2.5 Hz), typical for robust 1950s movements.
Power Reserve: Around 40-45 hours when fully wound.
Notable Features
The ETA 1100 stands out for its calendar complications, uncommon at the time:
Instantaneous date change at midnight.
Separate pushers for quick day and date adjustment— a rarity avoiding crown manipulation risks.
Optional month indicator in some variants.
This design prioritized user-friendliness, making it ideal for everyday wear while maintaining mechanical integrity.
Historical Context
Introduced post-WWII, the 1100 reflected ETA’s push toward affordable precision amid quartz threats. It appeared in steel-cased divers and elegant dress watches, showcasing Swiss engineering. Today, it’s prized by collectors for parts scarcity and restoration appeal. Servicing requires expertise due to discontinued spares.
Legacy and Collectibility
Vintage ETA 1100 watches, like Accurist models circa 1950, fetch premiums for originality. Its durability cements ETA’s reputation, influencing modern calibers. Enthusiasts value it for honest, no-frills horology.
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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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