The ETA 2826-2 is a reliable automatic mechanical movement from the ETA 2800 family, renowned in Swiss watchmaking for its precision and widespread use.

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Overview

Introduced in 2004, the ETA 2826-2 builds on the classic 2824-2 with a distinctive big date complication at 3:00, using overlapping discs for a larger display. It operates at 28,800 vibrations per hour (4 Hz) for smooth seconds hand motion and offers a 42-hour power reserve. With a height of 6.20 mm and 25 jewels, it fits versatile case designs while supporting bi-directional automatic winding via a central rotor.

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Key Specifications

Dimensions: 25.60 mm diameter, 6.20 mm thick

Jewels: 25

Frequency: 28,800 A/h
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Power Reserve: 42 hours

Functions: Hours, minutes, sweeping seconds, big date

Winding: Automatic with manual option

History and Availability

The original ETA 2826 appeared briefly from 1971-1977 in limited production, but the 2826-2 became a staple until phased out after 2021 due to Swatch Group restrictions. Post-2020, ETA limited sales to Swatch brands, prompting independents to adopt Sellita SW200 equivalents. It powered countless mid-range watches from brands like Tissot and Hamilton.
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Advantages for Enthusiasts

This movement excels in serviceability, with interchangeable parts across the 2800 series and proven accuracy. Vintage restorers value its robustness for repairs, though modern alternatives like Powermatic 80 offer longer reserves. Ideal for collectors seeking affordable mechanical reliability.

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The ETA 2826-2 is a reliable automatic mechanical watch movement from ETA, part of the Swatch Group’s 2800 family, prized for its precision and versatility in mid-range Swiss watches.
Key Specifications

Diameter: 25.6 mm, fitting standard 38-42 mm cases.

Height: 6.20 mm, allowing big date complication without excessive thickness.

Jewels: 25 synthetic rubies for reduced friction.

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

Power reserve: 38-42 hours with bi-directional rotor winding.

Accuracy: Typically -12/+12 seconds per day in chronometer grades.

History and Development

Introduced around 2004-2006, the ETA 2826-2 evolved from the base 2824-2 by adding a semi-instantaneous big date at 3 o’clock, enhancing readability for modern designs. It features hacking seconds for precise time-setting and Incabloc shock protection. Production continues despite Swatch Group export limits since 2020, pushing brands toward alternatives like Sellita SW330.
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Features and Reliability

This self-winding caliber offers central hours, minutes, seconds, and magnified big date, with a ball-bearing rotor for efficient winding. Known as a “workhorse,” it powers brands like Tissot, Hamilton, and Oris, balancing affordability with COSC certification potential. Service intervals reach 5-8 years due to robust construction.

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The ETA 2834-2 is a reliable Swiss automatic movement renowned for its day-date complications and widespread use in mid-range watches since the 1970s.
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Key Specifications

Introduced around 1974, the ETA 2834-2 measures 29mm in diameter (13 lignes) and 5.05mm thick, fitting standard 13-line cases. It beats at 28,800 vibrations per hour (4Hz) with 25 jewels, offering a power reserve of 38-40 hours. Features include Incabloc shock protection, a ball-bearing rotor, and quickset day/date mechanisms, with the day wheel uniquely positioned at 12 o’clock showing full English names.
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Historical Context

Developed by ETA SA (part of the Swatch Group), the 2834 evolved from earlier workhorses like the 2824 but added a day function, distinguishing it for dress and dive watches. Production peaked in the 1980s-2000s, powering brands like Tissot, Hamilton, and Certina before Swatch phased out clones in 2020, boosting aftermarket demand.
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Performance Highlights

Accuracy: Typically -12/+38 seconds per day, hackable for precise setting.
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Winding: 27-40 crown turns for full wind; rotor needs ~1.5 hours of motion.

Variants: Standard nickel finish; options for 3H/6H date.

Reliability: Proven in harsh conditions, with easy servicing due to modular design.

Applications and Legacy

Found in countless affordable luxury pieces, the 2834-2 excels in daily wear for its smooth sweep seconds and bidirectional winding. Enthusiasts value its parts availability, though modern alternatives like Sellita SW240-1 mimic it closely. At ~300 words, this movement remains a horology benchmark for value and durability.

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The ETA 2834-2 is a renowned automatic mechanical watch movement produced by ETA SA, a Swatch Group subsidiary, serving as the standard reference for the 2834-1 variant. Introduced in the 1970s and refined over decades, it powers countless mid-range watches from brands like Tissot, Hamilton, and Certina due to its reliability and serviceability.
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Key Specifications

This workhorse movement features a 25-jewel design with a 28,800 vph beat rate, delivering 38 hours of power reserve. Measuring 25.6mm in diameter and 4.6mm thick, it supports three-hand display with central seconds, date at 3 o’clock, and hacking seconds for precise time-setting. The bidirectional rotor ensures efficient self-winding, while Incabloc shock protection enhances durability.

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Technical Highlights

Accuracy: COSC-certified variants achieve -4/+6 seconds per day; standard models hold ±12 seconds.

Functions: Date quickset, interchangeable beat adjustment for easy regulation.

Variants: 2834-1 (base), 2834-2 (hacking), with upgrades like Nivachron hairspring in modern Powermatic 80 iterations extending reserve to 80 hours.

Historical Context

Evolving from Valjoux roots post-ETA merger, the 2834 family dominated the 1980s-2000s as Swiss watches shifted to quartz. Today, amid Swatch’s in-house push, it’s phased out but remains abundant in aftermarket parts for vintage repairs. Its modular design facilitates servicing, ideal for enthusiasts restoring classics.

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The ETA 2834-2 is a reliable automatic mechanical watch movement produced by ETA SA Manufacture Horlogère Suisse, renowned for powering mid-range timepieces from brands like Tissot, Hamilton, and Mido.
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Key Specifications

This self-winding caliber measures 11.5 lignes (about 25.6mm in diameter) with a height of 5.05mm and features 25 jewels. It beats at 28,800 vibrations per hour (4Hz), delivering central hours, minutes, seconds, and a date function at 3 o’clock. Power reserve lasts 38-42 hours when fully wound, supported by a bidirectional rotor with ball bearing.
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Grades and Accuracy

Available in grades like Standard, Elabore, and Top (with Glucydur balance and Incabloc shock protection), accuracy varies from ±12-30 seconds/day (Standard) to ±4-15 seconds/day (Top, 5-position adjusted). It includes hacking seconds and manual winding for precision setting.

​History and Applications

Evolved from the ETA 2824 family in the 1970s, the 2834-2 adds enhanced date reliability and shock resistance via Novodiac/Incabloc systems. Widely used in dive watches and dress models for its robustness and serviceability, it remains a benchmark despite ETA’s shift toward in-house calibers.

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The ETA 2836-2 is a reliable automatic mechanical watch movement from ETA’s 2800 series, prized for its day-date complications and widespread use in Swiss timepieces.
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Key Specifications

Size and Build: 11½ lignes (25.6 mm diameter), 5.05 mm height, 25 jewels, Incabloc shock protection.

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

Power Reserve: Approximately 38-42 hours when fully wound.

Core Features

Self-winding bidirectional rotor, manual winding option, and hacking seconds (stops for precise setting).

Day at 12 o’clock, date at 3 o’clock with quickset.

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Etachron regulator for accuracy; available in grades up to chronometer (COSC-certified variants exist).

​History and Usage

Introduced in the 1980s as an evolution of the ETA 2824-2, the 2836 adds a day indicator, powering brands like Longines, Omega, Tissot, and Mido. Production continues post-2020 Swatch Group restrictions, though alternatives like Sellita SW200 are common. Its robustness suits entry-to-mid luxury watches, with easy servicing via abundant spare parts.
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Reliability Factors

Shock-resistant and versatile, it excels in daily wear, maintaining precision within seconds per day in higher grades. Enthusiasts value its serviceability—full wind needs 30-40 crown turns. Vintage models may need cleaning, but new units install readily.

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The ETA 2836-1 is a renowned Swiss automatic watch movement from ETA (now part of Swatch Group), produced mainly from 1979 to 1982, celebrated for its reliability in mid-range timepieces.

​Key Specifications

This 25-jewel caliber operates at 28,800 vibrations per hour (4 Hz) with a 42-hour power reserve, supporting hours, minutes, sweep seconds, day (at 12 o’clock, multilingual quickset), and date (at 3 o’clock, quickset). It features a hacking seconds hand that stops when setting time via the crown and manual winding capability, requiring about 30-40 crown turns for full wind. Dimensions are 11.5 lignes (25.6mm diameter, 4.7mm thick), making it versatile for dress and dive watches.
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Historical Context

Introduced as an evolution of the ETA 2834, the 2836-1 added day-date complications, becoming a workhorse in brands like Tissot, Omega, and Longines during the quartz crisis recovery. Many units earned COSC chronometer certification for superior accuracy (-4/+6 seconds per day). Production ended early 1980s, but spares remain abundant for vintage repairs.

​Notable Features

Automatic rotor: Self-winds via wrist motion; bidirectional for efficiency.

Hack mechanism: Precise synchronization.

Robust build: Shock-resistant (Incabloc), anti-magnetic to ISO standards.

Serviceability: Easy disassembly; common in aftermarket upgrades.

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The ETA 2836-2 is a reliable workhorse automatic mechanical movement from ETA SA, a Swatch Group subsidiary, widely used in mid-range Swiss watches for its day-date complications and robust performance.

​Key Specifications

Size and Build: 11½ lignes (25.6mm diameter), 5.05mm height, 25 jewels, lever escapement.

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

Power Reserve: Approximately 42 hours when fully wound; bidirectional rotor with ball bearing.

Core Functions

This self-winding caliber features central hours, minutes, and seconds, plus day and date windows at 3 o’clock with quickset options. It supports manual winding and hacking seconds (second hand stops when setting time). Incabloc or Novodiac shock protection ensures durability, while Etachron regulation aids precision.

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The ETA 2837 is a reliable automatic mechanical watch movement from ETA SA Manufacture Horlogère Suisse, part of the Swatch Group. Produced briefly in the mid-1970s, it powers vintage Swiss watches with day-date complications, known for its precision and quick-set features.
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Key Specifications

Size and Build: 11.5 lignes (25.60mm diameter, 5.10mm height); 17 jewels.

Frequency: 36,000 beats per hour (5Hz) for smooth sweep seconds; 40-hour power reserve.

Functions: Hours, minutes, sweep seconds; quickset day (2 languages) and date.

Features and Performance

The movement includes a hacking seconds hand for accurate time-setting and belongs to the ETA 2800 family, evolving from manual-wind models like the 2821. Its high beat rate enhances timing stability, ideal for chronometer-grade watches like the Mido Commander. Robust construction ensures durability under daily wear, with easy servicing using standard ETA parts.
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Historical Context

Introduced around 1974-1975, the 2837 targeted mid-range automatics amid the quartz crisis. Variants include the slower 28,800 bph 2836; it’s less common today but prized by collectors for vintage restorations. Spare parts remain available from suppliers, supporting ongoing repairs.

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The ETA 2838 is a robust automatic mechanical watch movement from the renowned Swiss manufacturer ETA, part of the Swatch Group. Known for its reliability and high-beat performance, it powers numerous mid-range Swiss watches with day-date complications.
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Key Specifications

Size and Build: 13 lignes (29mm diameter), 5.25mm thick, 25 jewels.

Frequency: 36,000 vibrations per hour (5Hz) for smooth sweeping seconds.

Power Reserve: Approximately 40 hours when fully wound.

Functions: Hours, minutes, central sweeping seconds, day (curved at 12 o’clock, quickset), date (quickset at 3 o’clock).

Design and Features

This movement belongs to ETA’s 2800 family evolution, featuring a central rotor for bidirectional winding and Incabloc shock protection. Its high frequency enhances precision, rivaling more expensive calibers, while the quickset day-date mechanism adds practicality for daily use. Serviceable and durable, it uses a Glucydur balance and Nivarox hairspring for stability.

​Popularity and Usage

The ETA 2838 gained fame in the 1980s-1990s for its balance of performance and affordability, often found in brands like Tissot, Certina, and Longines. Post-2020 Swatch Group restrictions limited non-group sales, boosting alternatives like Sellita SW300. Collectors value its “workhorse” status in vintage divers and dress watches.

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