he ETA 2824-2 is a legendary Swiss automatic watch movement renowned for its reliability and widespread use across brands. Introduced in the 1970s and refined since 1982, it powers countless timepieces with proven durability.
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History

Born from ETA’s push for efficient mass production amid the quartz crisis, the 2824 evolved from the manual-wind ETA 2801 by adding an automatic module. It set industry standards for over 50 years, facing supply controversies in the 2010s before successors like the Powermatic 80 emerged.
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Key Specifications

Size and Jewels: 11.5 lignes diameter, 25 jewels (up from 17 in base models for automatic winding).

Beat Rate: 28,800 vph (4 Hz) for smooth seconds sweep.

Power Reserve: Approximately 38 hours when fully wound.

Features: Bidirectional ball-bearing rotor, manual winding, hacking seconds, Novodiac/Etachoc shock protection.

Accuracy Grades

Standard: ±12 to +30 sec/day, 2-position adjustment.

Elaboré: ±7 to +20 sec/day, 3 positions.

​Top: ±4 to +15 sec/day, 5 positions.

Chronomètre: -4/+6 sec/day, COSC-certified.

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The ETA 2824-1 is a foundational Swiss automatic mechanical watch movement from ETA SA, renowned for reliability and precision since its development in the 1970s. Often compared to the more common 2824-2 variant, it shares core specs but represents earlier grades with fewer jewels. This workhorse powers countless mid-range watches, offering smooth operation and easy servicing.
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Key Specifications

Diameter: 25.6 mm (11.5 lignes)

Height: 4.6 mm

Jewels: 17–25, depending on grade (2824-1 typically lower, e.g., 17–21)

Frequency: 28,800 vph (4 Hz) for fluid seconds sweep

Power Reserve: 38–42 hours

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

History and Development

Introduced around 1972 and refined by 1982, the ETA 2824 series evolved from Eterna Caliber 1427 (1950s). ETA SA, founded in 1856, prioritized ébauches production post-1932 split from Eterna. The 2824-1 denotes base grades, while 2824-2 adds jewels for the automatic rotor.
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Grades and Accuracy

Available in Standard (±12–30 sec/day, 2-position adjustment), Elaboré (±7–20 sec/day, 3 positions), Top (±4–15 sec/day, 5 positions), and Chronometer (COSC-certified, -4/+6 sec/day). Higher grades use Glucydur balance, Incabloc shocks.

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The ETA 2824-2: A Horology Workhorse

The ETA 2824-2 stands as one of the most reliable automatic mechanical movements in Swiss watchmaking, produced since 1982 and derived from the Eterna Caliber 1427. Known for its robustness, versatility, and widespread use across brands like Tissot, Hamilton, and Longines, it powers countless mid-range timepieces with proven durability.

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Key Specifications

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

​Jewels: 25, with bi-directional ball-bearing rotor.
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Frequency: 28,800 beats per hour (4Hz), 38-42 hour power reserve.

Functions: Hours, minutes, sweeping seconds, date at 3:00; hacking seconds, hand-windable.

Grades and Accuracy

The movement comes in four grades, differing in adjustment positions, components, and precision:

Standard: ±12 to +30 sec/day (2 positions).

Elaboré: ±7 to +20 sec/day (3 positions).

Top: ±4 to +15 sec/day (5 positions, upgraded balance/hairspring).

Chronometer: COSC-certified, -4/+6 sec/day.

Most units are Standard grade, averaging ±12 sec/day, yet often outperform specs when regulated.
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History and Legacy

Originating in 1972 as ETA 2824 (updated to -2 in 1982 with 25 jewels from 17), it evolved from Eterna designs post-Swatch Group integrations. Post-patent expiration, clones like Sellita SW200 emerged, but ETA’s original remains prized for serviceability—recommended every 5 years—and parts availability.

Pros and Usage

Reliable “workhorse” for daily wear, easy to service by watchmakers.

Found in brands like Certina, Oris, Tudor; customizable rotors.
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Its modular design (automatic module on ETA 2801 base) ensures longevity, making it ideal for enthusiasts and professionals seeking precision without complexity.

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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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