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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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The ETA 1256 is a vintage manual-wind mechanical movement from the renowned Swiss manufacturer ETA SA, celebrated for its reliability and precision in mid-20th-century timepieces.

Historical Background

Developed in the post-WWII era during ETA’s expansion under the Swatch Group precursor, the 1256 emerged from Fontainemelon roots tracing to 1790s ébauche production. It powered affordable luxury watches from brands like Omega and Tissot, embodying ETA’s monopoly-era dominance before regulatory scrutiny in the 2000s.
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Key Specifications

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

Functions: Hours, minutes, central seconds; manual winding with hack feature in some variants.

Frequency and Power: 18,000 vph (2.5 Hz), approximately 42-hour power reserve.

Finish: Geneva stripes on bridges, blued screws for aesthetic appeal in visible cases.

Performance and Reliability

Known for robust construction, the 1256 offers chronometer-grade accuracy when regulated, with adjustable regulator for fine-tuning. Its simple architecture minimizes service needs, making it ideal for restoration projects among collectors.

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The ETA 1260 is a vintage manual-wind mechanical movement produced by ETA in Switzerland during the 1950s and 1960s. Known for its reliability in dress watches, it features a compact design with sub-seconds at 6 o’clock.

Key Specifications

Size and Height: 10.5-11.5 lignes diameter, approximately 3.95 mm thick, making it slim for elegant cases.

Functions: Hours, minutes, and small seconds subdial; manual winding only, no automatic rotor.

Jewels: Typically 17-18 jewels for reduced friction and longevity.

Frequency: Standard 18,000 vph (2.5 Hz), with power reserve around 40-45 hours.
Historical Context

Introduced post-WWII, the ETA 1260 powered affordable luxury watches from brands like Pontiac, including the Pontiac Nageur diver and gold-plated dress models. Variants like Cal. 1280 and 1281 expanded the family with minor tweaks for specific applications. Its simple architecture made it ideal for servicing, though modern repairs may require donor parts due to rarity.
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Usage and Legacy

Common in 1950s Pontiacs and other mid-tier Swiss brands, the 1260 exemplifies ETA’s early dominance in workhorse calibers. Collectors value it for vintage restorations, but performance issues post-servicing—like balance jewel problems—highlight the need for skilled watchmakers. Today, it’s a favorite among horology enthusiasts for its clean aesthetics and historical charm.

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The ETA 1315 is a vintage automatic mechanical watch movement from the Swiss ETA 1300 family, renowned for its reliability in mid-20th-century timepieces. Produced primarily in the 1950s and 1960s, it features a 9.25 ligne diameter and serves as a robust base for various dress and sports watches. Its design emphasizes precision engineering with a central sweep seconds hand and bidirectional rotor winding.
Key Specifications

Size and Type: 9.25”’ (20.8mm diameter), automatic self-winding with hackable seconds in later variants.
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Jewels: Typically 17 or 25 jewels, reducing friction for longevity.

Frequency: 18,000 vph (2.5 Hz), balancing power efficiency and smoothness.

Power Reserve: Approximately 40-50 hours, powered by a single barrel.

Design Highlights

The ETA 1315 belongs to the ETA 1300 series, evolving from manual-wind models like the 1301 to include automatic functionality via a peripheral rotor. It shares DNA with siblings such as the 1316 (date) and 1317 (day-date), often used by brands like Omega and Longines for affordable yet durable calibers. Adjustments for temperature and positions ensure chronometer-grade potential in regulated examples.

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ETA 1317 Watch Movement Overview

The ETA 1317 belongs to the ETA 1300 family, a series of reliable automatic mechanical movements produced by ETA SA, a key Swiss manufacturer now under the Swatch Group. Introduced in the mid-20th century, it powered numerous mid-range watches during the 1950s and 1960s, valued for its robustness in everyday use.
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Key Specifications

Size and Type: 10.5 ligne diameter (about 23.3mm), automatic self-winding with center seconds hand.

Jewels: Typically 25 jewels for reduced friction and longevity.

Frequency: 18,000 beats per hour (2.5 Hz), offering smooth seconds sweep and a power reserve around 40-45 hours.

Functions: Hours, minutes, central seconds; some variants include date complications.

Height: Approximately 5.2mm thick, fitting slim cases.

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The ETA 1318 is a vintage automatic mechanical watch movement produced by ETA SA, renowned for its reliability in mid-20th-century Swiss timepieces. Introduced around 1955, it powered numerous dress and sports watches from brands like Omega and Tissot, embodying the era’s precision engineering.

Key Specifications

Size and Build: 8.75 lignes (19.7-19.4 mm diameter), 5.6 mm height, compact for slim cases.

Jewels: 17, reducing friction in critical pivots for longevity.

Frequency: 18,000 vibrations per hour (vph), balancing accuracy and durability.

Power Reserve: Approximately 34-40 hours when fully wound.

Design Features

This self-winding caliber features a central sweep seconds hand and bidirectional rotor with ball-bearing system for smooth operation. It uses a Swiss lever escapement and glucydur balance wheel, ensuring consistent rate despite positions. Part of ETA’s 1300 family (related to 1308/1322), it shares components like the manual-wind 1311/1312, aiding repairs.

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The ETA 1320 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA SA, part of the historic 1300 family introduced in the mid-20th century.
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Key Specifications

Diameter: 9.25 lignes (20.50 mm), fitting standard mid-size cases.

Height: 5.60 mm, enabling slim profiles.

Jewels: 17 synthetic rubies for reduced friction.

Frequency: 18,000 beats per hour (2.5 Hz), balancing power reserve and smoothness.

Features: Sweep seconds, self-winding bidirectional rotor, and date complication in variants.

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The ETA 2425 is a compact automatic movement that has been widely used in smaller watches, particularly dress and ladies’ timepieces. This movement is known for its reliability and efficient design, making it a popular choice among watchmakers and collectors alike.
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Key Specifications

Movement Type: Automatic

Size: 6.75 ligne (approx. 15.30 mm diameter)

Height: 4.95 mm

Frequency: 18,000 vibrations per hour (2.5 Hz)

Jewels: 17 or 21 jewels

Power Reserve: Approximately 35 hours

Complications: Typically date-only, though some variants may differ
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Regulator Type: Pinned or index regulator

Features and Use

The ETA 2425 is part of a family that includes the 2410 and 2415 manual wind movements, all sharing the same 18,000 A/h frequency.

Its small size makes it ideal for watches with limited case space, especially vintage and classic designs.

The movement is generally robust and easy to service, contributing to its longevity in the watch industry.

It is often found in brands seeking reliable, cost-effective automatic movements for smaller watches.

Bulletin Points

Compact automatic movement designed for small watches.

Operates at 18,000 A/h, ensuring good timekeeping accuracy.

17/21 jewels and 35-hour power reserve.

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Pinned or index regulator for fine-tuning.
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Commonly used in dress and ladies’ watches.

The ETA 2425 remains a solid choice for watchmakers and collectors seeking a dependable, small automatic movement with proven reliability.

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