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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The ETA 2801-2 is a reliable hand-wound mechanical movement from ETA, renowned in horology for its precision and simplicity. Introduced around 1982 as part of the ETA 2800 family, it powers classic timepieces with hour, minute, and central seconds hands. This 11.5 ligne caliber measures 25.6mm in diameter and 3.55mm thick, making it versatile for slim dress watches.
Key Specifications

Jewels: 17, reducing friction for longevity.

Frequency: 28,800 beats per hour (4Hz), ensuring smooth seconds hand sweep.

Power Reserve: Approximately 42 hours when fully wound.

Functions: Hacking seconds for precise time-setting; no date complication.

Winding: Manual, clockwise via crown; balance at 12 o’clock position.

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The ETA 2804 is a reliable manual-wind mechanical movement from ETA’s Mecaline family, prized for its precision in vintage and modern Swiss watches.

​Overview

Introduced as an update to the original ETA 2804, the Caliber 2804-2 features a compact 11½ ligne (25.60 mm) diameter and 3.35 mm height, making it ideal for slim dress watches. It operates at 28,800 beats per hour (4 Hz) with 17 jewels, ensuring smooth sweeping seconds and a power reserve of about 40 hours. This hand-winding caliber serves as the date-equipped variant of the ETA 2801-2, sharing DNA with popular automatics like the 2824-2 and 2836-2.
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Key Features

Manual Winding: Stem-wound with direct sweep seconds hand; hand sizes 1.50/0.90/0.25 mm (H/M/S).

Date Complication: Quickset date at 3 o’clock with semi-instantaneous change and hacking seconds option.

Shock Protection: Incabloc system for durability; bimetallic screw balance and Breguet hairspring for stability.

Finishing: Standard ETA quality with potential for Elabore or Top grades in higher-end models.

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The ETA 2804-1 is a reliable manual-wind mechanical movement from ETA SA, a Swatch Group subsidiary renowned for precision Swiss calibers. Produced as part of the Mecaline series, it powers numerous vintage and entry-level watches with its compact design and consistent performance.
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Key Specifications

Diameter: 25.6 mm (11.5 lignes), fitting standard 38-42 mm cases.

Height: 3.35 mm, ideal for slim profiles.

Jewels: 17, reducing friction in critical pivots.

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

Power Reserve: 42 hours when fully wound.

Design and Features

This three-hand movement (hours, minutes, sweep seconds) lacks date or automatic winding, emphasizing simplicity and serviceability. It uses Glucydur balance and Breguet hairspring for shock resistance via Incabloc system. Direct seconds at 9 o’clock enhances balance wheel visibility, appealing to enthusiasts.

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History and Usage

Introduced in the 1970s, the 2804-1 evolved from ETA’s workhorse lineup, similar to the automatic 2824-2 but manual. Brands like Tissot, Omega (early models), and independents adopted it for dress watches. Production phased out post-2000s amid Swatch’s Powermatic shift, but spares remain abundant.
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Advantages for Collectors

Affordable servicing (parts widely available).

High beat rate for accuracy (±12 sec/day).

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The ETA 2804-2 is a reliable manual-wind mechanical movement from ETA’s Mecaline family, prized by watch enthusiasts for its precision and serviceability.
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Key Specifications

This Swiss-made caliber measures 25.60mm in diameter and 3.35mm thick, with 17 jewels and a beat rate of 28,800 vibrations per hour (4Hz).
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It offers hours, minutes, central sweeping seconds, and a date window at 3:00, powered by a 42-46 hour reserve when fully wound.​
The Etachron regulator and Incabloc/Novodiac shock protection ensure durability in daily use.
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Comparison to Related Calibers

Vs. ETA 2801-2: Adds date complication while sharing the hand-wound base; no automatic winding.
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Vs. ETA 2824-2: Manual version of the automatic 2824-2, with fewer jewels (17 vs. 25) but similar frequency and reliability.

Family ties: Part of the 28,800 A/h series, including 2816 (day-date) and 2824 variants.

Parts and Serviceability

Common spares include barrel arbor (#195), escape wheel (#705), and date wheels like #2557/1, making repairs straightforward for professionals.
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Parts compatibility spans ETA 2801-2 to 2836-2, with nickel-plated balance and Nivarox hairspring in standard grades.​
Accuracy targets +12 seconds/day (standard), with elaborated/top grades improving to +7/+4 seconds.
Legacy and Use

Introduced as a robust workhorse, the 2804-2 powers vintage and modern watches, valued for easy regulation and widespread watchmaker familiarity.

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The ETA 2551 is a compact automatic mechanical watch movement produced by ETA from 1965 to 1972, renowned for its use in ladies’ watches.
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Key Specifications

Size: 7¾ lignes (17.5mm diameter, 17.2mm casing, 4.5mm height)
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Jewels: 21

Beat Rate: 21,600 bph (3 Hz) with 51° lift angle

Power Reserve: Approximately 42 hours

Functions: Sweep seconds, central hours/minutes, date quickset (correct by advancing time past 21:20-24:00)

Technical Highlights

This self-winding caliber features a bidirectional rotor via an innovative excenter mechanism with a single gear stage, using a lever and ratchet for efficient winding. A planet differential gear on the dial side blends automatic and manual power independently. It includes Incabloc shock protection and pin-lever escapement, making it reliable for slim cases despite its tiny footprint.

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