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The ETA 1081: A Vintage Workhorse Movement

The ETA 1081 is a manual-wind mechanical watch movement launched in 1955 by ETA SA, renowned for its reliability in mid-sized vintage timepieces. Larger than its sibling ETA 1080 at 11.5 lignes (26mm diameter), it shares a similar framework but features a broader mainplate for bigger cases. With beveled edges and hacking seconds capability, it exemplifies Swiss precision engineering from the post-war era.

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Key Specifications

Dimensions: 11.5”’ (25.6mm diameter), 4.15mm height

Jewels: 17 (variations up to 21 reported)

Frequency: 18,000 vph (2.5 Hz)

Power Reserve: ~40-42 hours

Lift Angle: 52 degrees; Incabloc shock protection

Functions: Central hours, minutes, sweeping seconds; 3 hands

Historical Context

Introduced during ETA’s expansion phase, the 1081 powered affordable yet durable watches amid the mechanical boom before quartz dominance. Its family includes the smaller 1080 (10.5”’), both emphasizing lever escapement and monometallic balance. Spare parts like barrels and detents remain available for restorers.

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The ETA 1121: A Reliable Manual Wind Movement

The ETA 1121 is a compact manual-wind mechanical watch movement produced by ETA SA, renowned for its precision and durability in vintage and mid-range timepieces. Introduced in the mid-20th century, it exemplifies Swiss horological engineering with a Swiss lever escapement and manual winding mechanism.

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Key Specifications

Size and Jewels: 11.75 ligne diameter, typically 17 jewels for reduced friction and enhanced longevity.

Functions: Hours, minutes, and small seconds at 6 o’clock; no date complication for simplicity.

Frequency: 21,600 vibrations per hour (3 Hz), balancing power reserve and accuracy.

Power Reserve: Approximately 42-46 hours when fully wound.

Design and Performance

Crafted with Incabloc shock protection, the ETA 1121 resists daily wear, making it ideal for robust vintage watches. Its Geneva-striped bridges and blued screws add aesthetic appeal visible through exhibition casebacks. Accuracy hovers around -10/+20 seconds per day, chronometer-grade in select variants.

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