The ETA 2658 is a reliable automatic mechanical watch movement from the ETA 2600 series, known for its slim profile and precision in mid-range timepieces. Produced by ETA SA Manufacture Horlogère Suisse, it powers numerous vintage and contemporary watches with consistent performance.
Key Specifications

Diameter: 17.2 mm (11.5 lignes), ideal for smaller cases.

Height: Approximately 5.35 mm, enabling thin designs.

​Jewels: 25, reducing friction for longevity.

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

Power Reserve: Around 38 hours when fully wound.

Features and Functions

This self-winding caliber includes a bidirectional rotor for efficient winding via daily wear. It supports central hours, minutes, and sweeping seconds, often with a date window. Equipped with Incabloc shock protection and Etachron regulator, it maintains accuracy under stress. Hand-winding is possible clockwise, adding versatility.

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ETA 2660 Watch Movement: A Classic Manual Caliber

The ETA 2660 is a reliable manual-wind mechanical movement from the ETA 2600 family, produced primarily in the 1970s. Known for its sweep seconds hand and optional hacking feature, it powered numerous Swiss watches until around 2010. This caliber exemplifies ETA’s early precision engineering, serving as a precursor to modern workhorses like the 2824-2.

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Key Specifications

Type: Manual wind, mechanical with sub-seconds or sweep seconds.

Dimensions: Compact size, approximately 9.0 mm thick; jewels include cap jewels for balance.

Functions: Hours, minutes, central or sub-seconds; optional hack mechanism.

Shock System: Options like Incabloc or ordinary protection.

Production Era: Active from 1971 (some sources suggest roots near 1945 via Geneva Sport influences) to 2010.

Historical Context

Originating in the 1960s-1970s ETA 2600 series, the 2660 emphasized durability for everyday wear. It appeared in branded watches like Geneva Sport models, with parts listed in Bestfit references from 1972. Its design prioritized serviceability, making it popular among watchmakers.
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Spare Parts Availability

Common parts remain accessible for repairs:

Mainsprings (e.g., 1.50 x 0.100 x 300 x 9.0 mm).

Balance complete (Incabloc versions).

Wheels like center, third, fourth, and escape.

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ETA 2661 is a compact, high‑beat manual-wind movement from ETA’s 2640 family, widely used in vintage ladies’ watches. It combines small diameter with robust performance and a practical date function.
Key specifications

Manual-wind mechanical movement

Diameter about 7.75 lignes (≈17.5 mm), thickness around 3.5 mm

High-beat rate of 28,800 vibrations per hour for improved stability and smoother seconds

Power reserve approximately 45 hours when fully wound

17‑jewel construction to reduce friction and wear in critical pivot points

Date display, typically at 3 o’clock, with quick indication change around midnight

Design and construction

Part of the ETA 2640 series, developed as a compact family derived from earlier Eterna designs and optimized for small cases.

Built with a conventional Swiss lever escapement and flat balance spring, prioritizing reliability and ease of regulation.

Layout favors serviceability: clearly defined gear train, accessible keyless works, and straightforward date mechanism, all helpful during overhaul and adjustment.

Use in watches and service notes

Commonly found in vintage and neo‑vintage ladies’ dress watches from various brands that sourced ébauches from ETA.

Suits thin, elegant cases thanks to its modest thickness and small diameter, without sacrificing beat rate or autonomy.

Watchmakers typically note good parts availability within the broader 2640 family, but original cosmetic components (dials, hands, branded rotors where applicable) can be more brand‑specific and harder to source.

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The ETA 2670 is a reliable automatic watch movement from the Swiss manufacturer ETA, part of the Swatch Group. Introduced in 1971, it powers ladies’ watches with its compact design and smooth operation. This 17-jewel caliber emphasizes precision for everyday wear.
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Key Specifications

Type: Automatic with sweep second hand and optional hacking feature.

Jewels: 17, reducing friction for longevity.

Size: Compact for smaller cases, often used in women’s models like Cartier Cal. 76 variants.

Winding: Rotowind mechanism; bi-directional in some executions.

Shock Protection: Incabloc system for durability.

Power Reserve: Typically around 38-42 hours, suitable for daily use.

Historical Context

Developed during ETA’s expansion of automatic movements, the 2670 belongs to the 2600 family, including siblings like 2671-2678 and 2681-2685. It gained popularity in luxury ladies’ watches from the 1970s through 2000s for its robustness. Spare parts, such as mainsprings, remain available, supporting vintage repairs.

Usage and Maintenance

Found in brands like Cartier, the ETA 2670 requires standard servicing every 5-7 years. Bi-directional winding ensures efficient power buildup via rotor motion. For winders, it needs moderate turns per day, clockwise or counter-clockwise. Enthusiasts value its interchangeability within the series.

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The ETA 2671 is a compact automatic mechanical watch movement renowned for its reliability in ladies’ and smaller unisex timepieces. Introduced in 1971 by ETA, part of the Swatch Group, it belongs to the 2600 family and powers numerous Swiss-made watches with precise timekeeping and a date function.

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Key Specifications

Size and Height: 7 3/4 lignes (17.2 mm diameter), 4.80 mm thick, ideal for slim cases.

Jewels: Typically 25 (some variants 17-21), reducing friction for longevity.

Frequency: 28,800 beats per hour (A/h), ensuring smooth seconds sweep.

Power Reserve: Approximately 38-44 hours when fully wound.

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

Features and Technology

This self-winding caliber uses bi-directional automatic winding via a central rotor, often gold-plated, with Incabloc shock protection for durability. It features a pallet lever escapement, nickel annular balance, and counterclockwise balance cock, supporting hackable seconds in many versions. Hand sizes fit 1.20/0.70/0.20 mm stems.
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Usage and Variants

Common in brands like Longines (as Cal. L561) and Oris (base for Cal. 581), the ETA 2671 excels in dress watches due to its precision and customizability. Part of the 2670/2680 series, it offers instant date change and remains in production for “Swiss Made” reliability.

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The ETA 2678 is a reliable automatic mechanical watch movement from ETA, part of the Swatch Group’s Mecaline series, designed for compact ladies’ watches.
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Key Specifications

Diameter: 7¾ lignes (17.2 mm), ideal for smaller cases.

Height: 5.35 mm, ensuring slim profiles.

Jewels: 25, reducing friction for longevity.

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

Power Reserve: 38-39 hours with bi-directional ball-bearing rotor.

Functions and Features

This calibre offers hour, minute, and central seconds hands, plus day-date complication with quickset date. It includes hacking seconds for precise time-setting and automatic winding via a bidirectional rotor. Based on the ETA 2671, it evolved for enhanced reliability in vintage and modern designs from 1971 onward.
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History and Usage

Produced by Swiss manufacturer ETA, the 2678 stems from post-WWII innovations in compact automatics, related to early bumper-wind models like the 30.10 family. Commonly found in brands like Tissot or Certina ladies’ models, it powers elegant dress watches with 38-hour reserves. Spare parts remain available, supporting repairs for enthusiasts.

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The ETA 2681 is a reliable automatic mechanical movement from ETA, ideal for ladies’ watches and compact designs.
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Overview

Introduced around 1981 as part of the ETA 2600 family, the Caliber 2681 belongs to the “Mecaline” line and remains in production. It serves as a slightly larger variant of the ETA 2671, measuring 19.4 mm in diameter (8¾ lignes) and 4.8 mm thick. Brands like Longines (as Cal. L580) and Rado have adopted it in models such as the D-Star Ceramos Automatic.
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Key Specifications

Jewels: 25, reducing friction for longevity.

Frequency: 28,800 beats per hour (A/h) for smooth seconds hand sweep.

Power Reserve: Approximately 44 hours when fully wound.

Winding: Bi-directional automatic with central rotor and ball-bearing.

Height: 4.80 mm, suiting slim cases.

Features and Functions

This movement includes central hour, minute, and seconds hands, plus a date complication at 3 o’clock with quickset correction and semi-instantaneous change. It features hacking seconds for precise time-setting, an ETACHRON escapement, flat hairspring, and eccentric regulator. The balance sits at 10:30 with a counter-clockwise cock.

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The ETA 2685 is a reliable automatic watch movement from the Swiss manufacturer ETA SA, known for powering mid-range timepieces with added complications.
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Overview

Introduced in the late 20th century, the ETA 2685 builds on ETA’s robust base calibers, incorporating a moonphase module for celestial tracking alongside standard timekeeping. This self-winding movement features a sweep seconds hand, quickset date, and quickset moonphase display, appealing to enthusiasts seeking poetic functionality without excessive complexity. It typically offers around 38-42 hours of power reserve, depending on configuration, and supports optional hacking for precise time-setting.
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Key Specifications

Type: Automatic mechanical with moonphase complication

Jewels: 25 (often gold-plated in premium variants)

Functions: Hours, minutes, central sweeping seconds, date at 3 o’clock, moonphase at 6 o’clock

Frequency: 28,800 vibrations per hour (4 Hz) for smooth operation

Diameter: Approximately 25.6 mm (11.5 lignes)

Height: Around 5.25 mm, suitable for thinner cases

Usage in Watches

Brands like Oris modified it into calibers such as the Oris 586 for moonphase models in the 2000s, showcasing its versatility in pilot and dress watches. Omega and others used similar ETA bases historically, though the 2685 appears in niche or custom builds. Today, it’s available as a spare part for restorations,

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The ETA 2688 is a compact automatic watch movement from ETA’s 2600 family, designed primarily for ladies’ watches with day/date complications.

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Overview

Introduced around 1985 and produced until about 2004, the ETA 2688 measures 8 3/4 lignes (19.40 mm diameter) with a height of 5.35 mm, making it ideal for slim cases. It features 17 jewels, a sweep seconds hand, and self-winding via a rotor. This movement beats at 21,600 vibrations per hour (3 Hz), offering a 38-hour power reserve when fully wound.
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Key Specifications

Size and Build: 19.40 mm diameter, 5.35 mm thick, 17 jewels.

Functions: Central seconds, day at 9 o’clock, date at 3 o’clock (quick-set).

Frequency: 21,600 bph; power reserve ~38 hours.

Winding: Bidirectional automatic rotor; manual winding option.

Base Model: Derived from ETA 2681.

Usage and Compatibility

Common in brands like Oris (as Cal. 583), the 2688 suits vintage and smaller automatic timepieces. Parts remain available through specialists like Beco-Technic, supporting repairs. Its reliability stems from ETA’s robust engineering, though servicing every 5-7 years is recommended for optimal performance.

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The ETA 2750 is a compact manual-wind mechanical watch movement from the Swiss manufacturer ETA, produced between 1969 and 1982. Part of the pre-2800 family, it shares components with earlier 2500/2600 series and later models, emphasizing reliability in slim designs. Over 6 million units were made, powering time-only watches from brands like Favre-Leuba.
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Key Specifications

Size and Beat Rate: 11.5 ligne diameter, 21,600 beats per hour (6 beats/second) for smooth sweeping seconds.
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Functions: Primarily time-only (hours, minutes, seconds); variants like ETA 2752 add date quickset via crown manipulation between 20-24 o’clock.

Jewels and Height: Typically 17 jewels, slim profile around 3.45mm thick, ideal for dress watches.

Family Variants

The 2750 anchors a versatile lineup at 21,600 bph:

ETA 2750: Base time-only, hand-winding.

ETA 2752: Date complication.

Higher-speed siblings like ETA 2751 (28,800/36,000 bph) for enhanced precision.
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Day-date options (e.g., 2758/2759) expand utility, with quickset features in select models.

Historical Context

Introduced in the late 1960s amid quartz threats, the 2750 bridged ETA’s 2500-era workhorses to modern 2800/2824 staples. Its shared parts (e.g., cannon pinion, minute bridge) reduced costs, aiding widespread adoption in vintage Swiss watches. Production ended in 1982 as automatics dominated.

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