The ETA 2779 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, part of the popular 2770 family produced between 1969 and 1982. Known for its robustness and widespread use in mid-range timepieces, it features day-date complications and a Triovis regulator for precise adjustments. Over 25 million units of this family were made, cementing ETA’s reputation in horology.
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Key Specifications

Diameter: 11.5 lignes (25.6 mm), fitting standard case sizes.

Height: 6.0 mm, accommodating day-date wheels.

Jewels: 25 synthetic rubies for reduced friction.

Beat rate: 21,600 vibrations per hour (A/h), offering 48-hour power reserve.

Functions: Sweep seconds, date, day display via dial aperture; quick date-setting and Triovis fine regulator.

Design and Features

This self-winding caliber pairs with the manual-wind ETA 2759 base. It uses an anchor escapement with direct sweep seconds and bidirectional rotor for efficient winding. The Triovis regulator enhances accuracy against temperature changes, while complications support +/-24-hour adjustments.
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Historical Context

Introduced in the late 1960s amid the quartz crisis, the 2779 powered brands like Omega, Tissot, and Longines. Production ended in 1982 as ETA shifted focus, but its parts remain available for servicing vintage watches.

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The ETA 2781 is a reliable automatic watch movement from the ETA 2770 family, produced between 1969 and 1982. Known for its quickset date function, it powered numerous vintage timepieces during its era. This article explores its key features and legacy in horology.
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Technical Specifications

Diameter: 11.5 lignes (25.6 mm), fitting standard case sizes.

Height: 5.9 mm, allowing slim profiles in dress watches.

Jewels: 17, 21, or 25, reducing friction for longevity.

Frequency: 21,600 vibrations per hour (vph), balancing accuracy and durability.

Power Reserve: Approximately 47-48 hours when fully wound.

Lift Angle: 52 degrees, optimizing balance wheel performance.

Design and Functions

The ETA 2781 features bidirectional automatic winding via a rotor, paired with a manual hand-winding option through its corresponding ETA 2761 base. Its standout quickset date mechanism simplifies adjustments, a boon for daily wearers. Shock protection (Incabloc or similar) safeguards the balance during impacts, while the Triovis regulator option in variants enhances precision.

​Historical Context

Part of ETA’s prolific 2770 series—over 25 million units made—this movement emphasized affordability and serviceability amid the quartz crisis. It appeared in brands like Omega and Tissot, often in mid-range automatics. Production ended in 1982, but NOS examples remain available for restorers.

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The ETA 2782 is a vintage Swiss automatic watch movement produced by ETA SA, renowned for its reliability in mid-20th-century timepieces.
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Key Specifications

Introduced in the 1960s or early 1970s, the ETA 2782 features a central rotor for self-winding, a sweep seconds hand, and quickset date at 3 o’clock. It typically includes 25 jewels, Incabloc shock protection, and optional hacking (seconds hand stops when crowning for setting). Beat rate stands at 21,600 vph (3 Hz), with a power reserve around 38-42 hours.

Dimensions: 11.5 lignes (25.6mm diameter), 4.6mm thick.

Functions: Hours, minutes, central sweeping seconds, date.

Winding: Bi-directional automatic rotor; hand-windable.

Lift angle: Approximately 52 degrees.

Design and Variants

This movement belongs to ETA’s 2700 series, emphasizing economy and robustness for everyday watches. Variants like the 2783 may add day-date, but the base 2782 prioritizes simplicity. It shares architectural traits with the 2800 family (e.g., 2824), including dial feet positions for easy swapping.
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Usage in Watches

Found in brands like Titoni Airmaster, OLMA, and Alpina, often in gold cases from the 1960s. Collectors value it for serviceability during full restorations, with parts like calendar wheels and motion works commonly addressed.
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The ETA 2783 is a reliable automatic mechanical watch movement from ETA, produced primarily in the 1970s. Known for its robust design and date complication, it powered numerous vintage timepieces during its era. This article explores its key features, history, and technical specs.
Overview

Introduced around 1969-1974, the ETA 2783 belongs to the 2700 family, related to the iconic ETA 2824 but with a slower beat rate. Production totaled about 162,000 units, featuring 25 jewels, Incabloc shock protection, and a sweep seconds hand. It uses a pallet lever escapement and Breguet hairspring for precise timekeeping.
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Key Specifications

Size: 11½ lignes (round), approximately 25.6mm diameter, 5.20mm thick.

Beat Rate: 21,600 vibrations per hour (6 beats/second), with a 52° lift angle.

Functions: Automatic bidirectional winding via excenter mechanism, central sweep seconds, date window (quick-set by advancing time past midnight).

Jewels and Protection: 25 ruby jewels with ruby rollers; Incabloc shock system; optional hacking seconds.

Balance: Nickel annular balance with adjustment screws and movable stud; clockwise winding direction.

Design Highlights

The movement employs a yoke (excenter) winding system and double regulator for fine adjustments, either via long arm or directly on the hairspring. Unlike the higher-beat 2824, it prioritizes durability over speed, using a non-ball-bearing rotor. Variants like the 2782/2789 offer manual or day-date options in the family.

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The ETA 2784 is a vintage automatic mechanical watch movement produced by ETA, renowned for its reliability in mid-20th-century timepieces.
Overview

Developed as part of ETA’s 27XX family, the 2784 features automatic winding with a date complication, making it suitable for dress and sports watches from brands like Tudor, Titoni, and Tourist. Produced primarily from the 1970s, it emphasizes robust construction with 25 jewels to reduce friction and enhance longevity. This ebauche movement powered affordable yet durable watches during an era of mechanical innovation.
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Key Specifications

Dimensions: 11.5 ligne (25.6mm diameter), 5.2mm height for slim profiles.

Functions: Hours, minutes, central seconds, date window at 3 o’clock.

Frequency: 21,600 vibrations per hour (3 Hz) for smooth operation.

Power Reserve: Approximately 42 hours with self-winding rotor.

Jewels: 25, including shock protection for mainspring barrel.

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The ETA 2789-1 is a vintage automatic mechanical watch movement produced by ETA, renowned for its reliability in mid-20th-century timepieces. Developed around 1949, it pioneered a ball-bearing rotor in gents’ automatics and powered brands like Rado, Certina, and Edox.
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Key Specifications

Size: 11.5 lignes (25.6 mm diameter, 5.9 mm height)

Jewels: 25 (some variants with 17 or 21)

Frequency: 21,600 vph (3 Hz)

Power Reserve: Approximately 38-47 hours

Functions: Hours, minutes, sweeping seconds, day-date at 3:00 with quickset

Notable Features

This self-winding caliber supports manual winding and bidirectional rotor action. It includes Incabloc shock protection and variants with T- or U-shock systems, plus multilingual day displays. Production spanned the late 1960s to early 1980s, evolving into the ETA 2824 family.
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Historical Context

As part of ETA’s 2700/2800 series, the 2789-1 featured innovations like a stem release button for easy servicing. Variants (e.g., TC, UT, UC) arose from modifications, making it a staple in affordable Swiss watches. Today, it’s prized by collectors for repairs and NOS parts availability.

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The ETA 2790-1 is a compact automatic mechanical watch movement renowned for its reliability and slim profile, ideal for dress watches.

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Overview

Produced by ETA SA from 1976 to 1980, the ETA 2790-1 features a 11.5 ligne (25.6 mm) diameter and measures just 3.65 mm thick, making it suitable for ultra-thin cases. Approximately 1,033,700 units were manufactured, reflecting its popularity among Swiss watchmakers. It belongs to the ETA 2700 family, emphasizing precision engineering with a self-winding rotor.
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Key Specifications

Mechanism: Automatic with sweep seconds and central rotor.

Beat Rate: 36,000 vibrations per hour (10 beats per second) for smooth seconds hand motion.
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Jewels: 17, reducing friction for longevity.

Power Reserve: Around 42 hours.

Functions: Day-date at 3 o’clock with quick-set mechanism.
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Frequency Variant Note: Related models like 2789-1 run at 21,600 bph, but 2790-1 prioritizes higher beat for finesse.

Design and Features

The movement uses a Glucydur balance wheel and Nivarox hairspring for shock resistance (Incabloc standard). Its double date capability and quick-set day/date enhance usability, as seen in assembly guides highlighting the intricate date wheels. Parts like the main plate (No. 100) and bridges remain available for repairs, supporting vintage restorations.

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The ETA 2791 is a compact automatic watch movement from ETA’s 2700 series, prized for its reliability in vintage and modern timepieces. Known for slim design and practical features, it powers numerous Swiss watches with precise timekeeping.

​Key Specifications

Size and Build: 11.5 ligne (25.6mm diameter), 4.1mm height, 17 or 21 jewels depending on variant.

Frequency: 28,800 vph (4 Hz), offering smooth sweep seconds.

Power Reserve: Approximately 42 hours.

Functions: Hours, minutes, central seconds, date at 3 o’clock with quickset.

Features and Performance

This movement includes an automatic bidirectional rotor for self-winding and optional hacking seconds for precise setting. Its slim profile suits thinner cases, comparable to day/date models in height. Robust construction ensures durability, with Incabloc shock protection in many versions.​
Historical Context

Introduced in the 1970s as part of ETA’s workhorse 2800/2900 family evolution, the 2791 remains in demand for repairs and custom builds. It underpins brands like Tissot and Omega in entry-level automatics.

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The ETA 2801 is a reliable manual-wind mechanical movement from Swiss manufacturer ETA, known for its precision in vintage and entry-level watches.
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Key Specifications

Diameter: 25.6 mm (11½ lignes), compact for mid-sized cases.

Height: 3.35 mm, slim profile ideal for thinner designs.

Jewels: 17, reducing friction in critical pivots.

Frequency: 28,800 vph (4 Hz), ensuring smooth seconds hand sweep.

Power Reserve: 42-46 hours when fully wound.

Design and Features

This hand-wound caliber displays hours, minutes, and central seconds via analog hands (sizes: 0.90 mm, 1.50 mm, 0.25 mm). It uses an ETACHRON regulator for accurate adjustments and features a hackable seconds hand for precise time-setting. Part of the ETA 2800 family, it serves as a base for variants like the 2804-2 (with date). Produced since the 1980s, it’s prized for serviceability and availability of spare parts in horology circles.
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Usage and Legacy

Found in brands like Tissot, Omega, and custom builds, the 2801 powers affordable mechanical watches emphasizing craftsmanship over complications. Its manual winding appeals to purists, requiring daily crowns turns for optimal performance. Skeleton versions reveal intricate finishing, popular among repair specialists. Despite Swatch Group restrictions, NOS units remain accessible for restorers.

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The ETA 2801-1 is a reliable hand-wound mechanical movement from ETA SA, a Swatch Group powerhouse known for precision Swiss engineering. This 11½ ligne caliber excels in vintage and custom watch builds due to its slim profile and robust performance.
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Key Specifications

Size and Build: 25.6mm diameter, 3.35mm height; 17 jewels reduce friction for longevity.

Beat Rate: 28,800 vibrations per hour (4 Hz) for smooth sweep seconds.

Power Reserve: 42 hours, ideal for daily winding without constant attention.

Functions: Hours, minutes, central seconds; ETACHRON regulator for accuracy.

Historical Context

Introduced in the late 20th century, the ETA 2801-1 evolved into variants like the 2801-2, serving as a base for many independent watchmakers. Its manual wind design appeals to purists avoiding automatics, often seen in dress watches or skeletonized versions. Production as new old stock ensures availability for repairs.

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Performance and Use

Accuracy hovers around -10/+20 seconds per day, hackable for precise setting. Compatible with hands (0.90/1.50/0.25mm) and analog displays, it powers affordable luxury pieces. Enthusiasts value its serviceability, with parts widely available despite Swatch’s 2011 export restrictions.

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