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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The ETA 2751 is a manual-wind mechanical watch movement from the renowned ETA 2750 family, prized by collectors for its reliability and compact design.
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Overview

Produced from around 1969 to 1982, the ETA 2751 measures 11.5 lignes (about 25.6 mm in diameter) and beats at 21,600 vibrations per hour, offering a power reserve of roughly 42 hours. This hand-winding caliber features Swiss lever escapement with direct-sweeping seconds but lacks hacking seconds, a common trait in vintage movements of its era. Over 6 million units from the 2750 series were made, highlighting ETA’s mass-production prowess during Swiss watchmaking’s quartz crisis transition.

​Key Specifications

Size and Jewels: 11½”’ ligne, typically 17 jewels for smooth operation.

Functions: Time-only (hours, minutes, sweeping seconds).

Beat Rate: 21,600 bph (3 Hz), balancing precision and longevity.

Winding: Manual via crown; no automatic rotor.

Finishes: Often Geneva-striped bridges, blued screws for aesthetic appeal.

Historical Context

Part of ETA’s evolution from the 2500/2600 families to the modern 2800 series, the 2751 shared components like the cannon pinion and minute wheels, aiding serviceability. Used in mid-range Swiss watches from brands like Omega and Tissot precursors, it powered affordable mechanical timepieces amid industry shifts. Production ceased as automatics like the ETA 2771 gained favor, but its durability endures in vintage restorations.

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Collectibility and Maintenance

Today, ETA 2751 movements fetch value in the secondary market due to scarcity and interchangeable parts within the family. Spare parts remain available via specialists, though cap jewels and springs require careful sourcing. Servicing involves standard demagnetization and lubrication for optimal performance, making it ideal for horology enthusiasts restoring 1970s classics.

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The ETA 2752 is a manual-wind mechanical watch movement from the Swiss manufacturer ETA, part of the compact 2750 family produced between 1969 and 1982.
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Overview

This 11.5 ligne movement features a sweep seconds hand and date complication at 3 o’clock, with quick-setting via crown adjustment between 20-24 hours. It operates at 21,600 beats per hour for smooth timekeeping, housing 17 jewels to reduce friction. Over 6 million units were made, powering affordable mid-range watches from brands like Longines and Omega derivatives.

​Key Specifications

Size and Beat Rate: 11.5”’ diameter, 21,600 A/h (3 Hz), 4.5mm height.

Functions: Hours, minutes, sweeping seconds, date quickset (no hacking).

Jewels and Finish: 17 jewels; three-quarter plate with bridges, nickel plating.

Winding: Manual via crown; no automatic rotor.

Historical Context

Introduced post-ETA’s 1960s merger, the 2752 bridged earlier 2500/2600 families and modern 2800 series, sharing components like the minute wheel. Common in 1970s dress watches, NOS examples remain available for restorations. Its reliability suits collectors valuing vintage ETA robustness amid quartz crisis pressures.

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The ETA 2763 is a reliable manual-wind mechanical movement from the Swiss manufacturer ETA, part of the 2700 series produced between 1969 and 1976.
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Key Specifications

Size and Build: 11.5 lignes (26 mm diameter, 4.00 mm height), with 17/21 jewels for reduced friction.

Frequency: 21,600 vibrations per hour (vph), offering smooth sweep seconds.

Power Reserve: Approximately 50 hours when fully wound.

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

Design Features

This calibre uses a Swiss lever escapement and balance wheel for precise timekeeping, with a 52° lift angle. The manual stem-winding mechanism allows direct crown operation for setting time and date, while the quickset date enhances usability. Its compact profile suited mid-sized dress watches from brands like Omega and Tissot.
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Historical Context

Introduced in the late 1960s, the ETA 2763 bridged manual traditions amid the quartz shift, emphasizing durability for everyday wear. Production ceased by 1976, making it a vintage favourite among collectors. Spare parts like winding stems remain available.

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