ETA 2639 is a robust automatic day-date workhorse from ETA’s 2600 family, widely used in reliable everyday watches from the 1970s onward. Below is a concise article with highlighted bullet points for quick reference.
Overview

The ETA 2639 is a Swiss-made automatic movement known for its practical day-date layout, central seconds, and durable construction suited to daily wear watches of its era. It belongs to the broader 26xx family, sharing many components and architecture traits with related calibers.
Key technical specifications

Automatic winding with central sweep seconds

Day and date display with quickset function

Diameter around 29.0 mm (13’’’ ligne size)

Height around 4.9–5.0 mm

Beat rate 21,600 vibrations per hour (3 Hz)

Power reserve typically around 40–42 hours

Jewel counts commonly 17, 21 or 25 jewels depending on execution

Design and construction

The architecture favors serviceability, with a conventional automatic module driving a centrally mounted seconds hand and a straightforward calendar mechanism. Bridges and plates typically follow the clean, functional finish expected from mid-range Swiss ébauches of the period rather than elaborate decoration.
Calendar and user features

Day and date arranged in a classic dual-window configuration on most dials using this caliber

Quickset calendar allows faster correction of at least the date, often both indications, via the crown

Hand-winding capability complements automatic winding for watches that are not worn daily

Practical watchmaking notes

Watchmakers often appreciate the ETA 2639 for its parts availability (shared with other 26xx calibers) and predictable behavior on the timing machine. Regulation to acceptable daily rates is usually straightforward, aided by the 3 Hz beat rate which balances shock resistance and energy consumption. For collectors and technicians, it represents a dependable, easily serviced vintage automatic movement rather than a high-complication or haute horlogerie piece.

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The ETA 2789 is a vintage automatic mechanical watch movement renowned for its reliability in mid-20th-century timepieces. Produced primarily from the 1950s to the 1970s by ETA SA, it powered numerous Swiss brands with its self-winding day-date complication. This 11.5 ligne caliber exemplifies robust engineering from the post-war era.

​Key Specifications

Dimensions: 25.6mm diameter, 5.9mm height, suitable for men’s watches around 37mm case size.
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Jewels: 17 or 25, depending on variant, reducing friction in critical pivots.

Beat Rate: 21,600 vph (3 Hz), with a 52-degree lift angle for smooth operation.

Power Reserve: Approximately 38 hours when fully wound.

Features and Functions

The movement offers central hours, minutes, and sweeping seconds, plus day-date at 3 o’clock with quickset mechanisms. It supports manual winding and bidirectional rotor winding, often with ball-bearing for efficiency in early models. Variants like the 2789-1 include bilingual day displays. Anti-shock Incabloc protection ensures durability. Hacking seconds aid precise time-setting.
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History and Variants

Introduced around 1956, the ETA 2789 evolved from earlier designs like Eterna influences, featuring an indirect minute drive for a larger balance. Production spanned 1969-1980 for base models, with modifications like T-to-U shock changes creating sub-variants (e.g., TC, UT, UC). It appeared in watches by Rado, Certina, Edox, and others.
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Service Considerations

Common in vintage repairs, the 2789 requires careful stem handling due to its keyless works layout. Parts remain available via specialists, though full disassembly checks motion and auto works. Its straightforward design appeals to horologists restoring classics.

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The ETA 2858 is a reliable manual-wind mechanical movement from the Swiss manufacturer ETA, part of the 2800 series produced since the 1970s. Known for its precision and bilingual day-date complications, it powers numerous vintage watches with a classic sweep seconds hand. This caliber emphasizes economical design while maintaining high standards, making it popular among collectors and repair specialists.
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Key Specifications

Size and Build: 11.5 lignes (25.60mm diameter), 4.15mm thickness, 17 jewels.

Frequency: 28,800 vibrations per hour (4 Hz) for smooth operation.
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Power Reserve: Approximately 50 hours when fully wound.

Functions: Hours, minutes, sweep seconds; quickset bilingual day (2 languages) and date at 3 o’clock with instant change.

Features and Reliability

The movement includes Incabloc shock protection and supports hand-winding without hacking. Its slim profile fits diverse case sizes, from dress to sports watches. Compared to automatic siblings like the 2878, the 2858 offers simplicity for manual enthusiasts, with shared dial feet for easy swapping.

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The ETA 2895-1 is a Swiss-made automatic mechanical watch movement renowned for its precision and reliability in mid-to-high-end timepieces. Produced by ETA (part of the Swatch Group), it evolved from the popular 2892-A2 base in the late 1990s, adding a small seconds subdial at 6 o’clock for enhanced readability.

​Key Specifications

Dimensions: 11½ lignes (26.20 mm diameter), 4.35 mm height (5.80 mm total with rotor).

Jewels: 30 (including anti-shock protection).

Frequency: 28,800 vph (4 Hz), with a 53-degree lift angle.

Power Reserve: 42 hours.

Winding: Bi-directional automatic rotor with ball bearings; hacking seconds for precise time-setting.

Notable Features

This movement includes a date window at 3 o’clock, quick-set functionality, and three-hand display (hours, minutes, small seconds). Its slim profile suits dress watches, while robust construction ensures accuracy of -10/+20 seconds per day (COSC chronometer potential in variants). Bi-directional winding optimizes energy from wrist motion.
History and Usage

Introduced around 1997 and produced until the early 2000s, the 2895-1 powered brands like Omega, Tissot, and Longines before ETA restricted sales in 2006 (now via “Powermatic” evolutions). Spare parts remain available for vintage repairs, appealing to collectors. Its modular design allows easy servicing.

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The ETA 2895-2 is a reliable Swiss automatic watch movement renowned for its slim profile and precision, introduced in 1999 as part of ETA’s 2890 family.

​Key Specifications

Diameter: 25.6 mm (11½ lignes), with a movement height of 4.35 mm and total height of 5.80 mm.

​Jewels: 27, including additions from its small seconds module.

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

​Power Reserve: Approximately 42 hours, powered by bi-directional automatic winding with a ball-bearing rotor.

​Features and Functions

This modular movement builds on the ETA 2892-A2 base, adding small seconds at 6 o’clock and a date window at 3 o’clock with quickset correction. It includes hacking seconds for precise time-setting and supports grades like Elabore, Top, and Chronometer for varying accuracy levels. The ETACHRON regulator and stone lever escapement enhance stability.

​History and Usage

Launched to replace the ETA 2895-1, it remained in production through 2021 for non-Swatch Group brands, with proprietary versions continuing. Brands like TAG Heuer (as Calibre 6) have used it in high-end models for its robustness and serviceability. Dimensions suit mid-size dress watches, with hand sizes of 150/90/25 for hour/minute/small seconds.

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The ETA 2896 is a Swiss automatic watch movement renowned for its big date complication, derived from the reliable ETA 2892-A2 base.
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Key Specifications

Introduced around 2003-2004, this third-generation ETA 2890 family caliber measures 25.6mm in diameter (11.5 lignes) and 4.85mm thick, with 22 jewels and a 28,800 vph beat rate. It offers 42 hours of power reserve via a bi-directional ball-bearing rotor, Incabloc shock protection, ETACHRON regulator, and hacking seconds for precise setting. The lift angle stands at 51 degrees, supporting hand-wind capability and three central hands.

Notable Features

Big Date Display: Uses dual concentric overlapping wheels at 3:00 for a clear double-digit view, quickset adjustable.

Modular Design: Slim profile allows easy addition to base movements, ideal for luxury complications.

Reliability: Swiss-made with robust construction, powering numerous high-end watches until ETA restricted sales post-2021 to Swatch Group.

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The ETA 2897 is a reliable automatic watch movement from ETA SA Manufacture Horlogère Suisse, renowned for powering mid-to-high-end Swiss timepieces. Derived from the popular ETA 2892-A2 base, it incorporates a modular design with added complications for enhanced functionality. Introduced around 2004, it remained in production until about 2021 for non-Swatch Group brands.
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Key Specifications

Diameter: 25.6 mm (11.5 lignes), fitting standard 40-42 mm cases.

Height: 4.85 mm, slim profile ideal for dress watches.

Jewels: 21, reducing friction for longevity.

Frequency: 28,800 vph (4 Hz), balancing smoothness and power efficiency.

Power Reserve: Approximately 42-50 hours when fully wound.
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Features and Complications

This self-winding caliber features bi-directional winding via a central rotor, hours/minutes/seconds hands, a date window, and a power reserve indicator—often at 6 o’clock for quick glances. It supports hacking (seconds stop when crown pulled) and manual winding, with grades from Elabore to Chronometer for varying accuracy (±12 to COSC standards). Its modular setup allows easy addition of modules without altering the core.

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The ETA 7001 is a timeless mechanical hand-wound movement renowned for its slim profile and reliability in vintage-inspired watches.

​Overview

Introduced in 1971 by ETA/Peseux, the 7001 measures 10½ lignes (23.3mm diameter) and just 2.5mm thick, making it ideal for slim cases. This lever escapement caliber beats at 21,600 vph (3Hz) with 17 jewels and offers a 42-45 hour power reserve. It features central hour and minute hands, a small seconds at 6 o’clock, and Incabloc shock protection.
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Key Specifications

Dimensions: 23.3mm diameter, 2.5mm height (H2 type)

Jewels: 17, reducing friction in critical pivots

Frequency: 21,600 bph for smooth seconds sweep

Power Reserve: Approximately 42-45 hours when fully wound

Accuracy: Middle rate of +/-7 seconds/day; index or Etachron regulator

Hands: 1.30/0.80/0.17mm (hour/minute/small seconds)

Finish: Brass plates/bridges, nickel plating, beveled edges
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Historical Significance

Produced until recent years, the 7001 powered watches from Tissot, Longines, Omega, Nomos (1992-2005), Baume & Mercier, and modern brands like Baltic and Furlan Marri. It’s a direct replacement for Peseux 7001 and base for variants like Omega 651 or Ball automatics. Brands like Ming have heavily modified it for custom aesthetics.

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The ETA 9154, also known as the Ebauches SA or ESA 9154, represents an early bridge between mechanical and electronic watchmaking. Introduced around 1970, this vintage “Dynotron” movement marked a transitional phase in horology with its electronically controlled balance motor. Produced into the mid-1970s, it powered various watches during the quartz revolution’s dawn.
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Key Features

Electronic Regulation: Uses a transistor-based circuit to control the balance wheel, enabling a smooth sweep seconds hand unlike abrupt quartz stepping.

Calendar Functions: Includes quickset date, with some variants offering day-date complications via dedicated wheels and jumpers.

Hack Mechanism: Features mechanical and electrical stopping for precise time-setting, plus a sweep second pinion.

Battery-Powered: Relies on a standard cell (e.g., reference 343) with a fixing clamp, driving the motor electronically.

Technical Specs

Size and Build: Compact design with auxiliary plates, balance bridge, and interchangeable parts like those in related ETA/ESA 9157/9158 calibers.
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Components: Key elements include cannon pinion (SS, ref 245/1193), minute wheel (260/1109), and regulator (2-piece, 301/1399).

​Maintenance Notes: Prone to circuit issues like resistance in ESC contacts; repair involves cleaning solder residue.
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Historical Context

Ebauches SA, later absorbed into ETA, produced the 9154 amid 1970s innovation. Collectors value its quirky hybrid nature—mechanical gears with electronic pulses—for vintage restorations. Spare parts remain available for wheels, screws, and modules, supporting ongoing repairs.

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