The ETA 2804-2 is a reliable manual-wind mechanical movement from ETA’s Mecaline family, prized by watch enthusiasts for its precision and serviceability.
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Key Specifications

This Swiss-made caliber measures 25.60mm in diameter and 3.35mm thick, with 17 jewels and a beat rate of 28,800 vibrations per hour (4Hz).
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It offers hours, minutes, central sweeping seconds, and a date window at 3:00, powered by a 42-46 hour reserve when fully wound.​
The Etachron regulator and Incabloc/Novodiac shock protection ensure durability in daily use.
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Comparison to Related Calibers

Vs. ETA 2801-2: Adds date complication while sharing the hand-wound base; no automatic winding.
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Vs. ETA 2824-2: Manual version of the automatic 2824-2, with fewer jewels (17 vs. 25) but similar frequency and reliability.

Family ties: Part of the 28,800 A/h series, including 2816 (day-date) and 2824 variants.

Parts and Serviceability

Common spares include barrel arbor (#195), escape wheel (#705), and date wheels like #2557/1, making repairs straightforward for professionals.
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Parts compatibility spans ETA 2801-2 to 2836-2, with nickel-plated balance and Nivarox hairspring in standard grades.​
Accuracy targets +12 seconds/day (standard), with elaborated/top grades improving to +7/+4 seconds.
Legacy and Use

Introduced as a robust workhorse, the 2804-2 powers vintage and modern watches, valued for easy regulation and widespread watchmaker familiarity.

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The ETA 2551 is a compact automatic mechanical watch movement produced by ETA from 1965 to 1972, renowned for its use in ladies’ watches.
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Key Specifications

Size: 7¾ lignes (17.5mm diameter, 17.2mm casing, 4.5mm height)
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Jewels: 21

Beat Rate: 21,600 bph (3 Hz) with 51° lift angle

Power Reserve: Approximately 42 hours

Functions: Sweep seconds, central hours/minutes, date quickset (correct by advancing time past 21:20-24:00)

Technical Highlights

This self-winding caliber features a bidirectional rotor via an innovative excenter mechanism with a single gear stage, using a lever and ratchet for efficient winding. A planet differential gear on the dial side blends automatic and manual power independently. It includes Incabloc shock protection and pin-lever escapement, making it reliable for slim cases despite its tiny footprint.

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The ETA 2620 is a classic automatic mechanical watch movement from ETA, renowned for its reliability in vintage timepieces. Introduced around the 1960s, it powers numerous Swiss watches with a time-only configuration and sweep seconds hand.
Key Specifications

Size and Design: 11.5 lignes (about 25.6mm diameter), slim profile suitable for dress watches.

Beat Rate: 21,600 vibrations per hour (vph), offering smooth seconds hand motion.

Power Reserve: Approximately 40-42 hours when fully wound.

Jewels: Typically 17-21 synthetic rubies for reduced friction.

Historical Context

Produced by ETA SA (part of the Swatch Group), the 2620 belongs to the 2600 family, emphasizing efficiency and modern gear trains still influential today. It lacks date complications, focusing on simplicity, and was widely used in mid-range brands from the 1960s onward. Variants like 2622 add day/date features.
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Technical Highlights

The movement features a central rotor for bidirectional automatic winding, glucydur balance wheel, and anuvin regulation. Its gear train—mainspring barrel, second wheel, third wheel, and direct center wheel—ensures precise timekeeping. Service parts like barrels (Part 182) remain available for restorers.

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The ETA 2640 is a compact, manual-wind mechanical movement from ETA SA, renowned for its reliability in ladies’ watches. Produced primarily from the 1970s to 1980s, it exemplifies Swiss horological precision with a small footprint ideal for slim cases.

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Key Specifications

Size and Dimensions: 7.75 lignes (17.5mm diameter, 3.5mm height), perfect for petite timepieces.

Frequency: 21,600 beats per hour (3 Hz), balancing smoothness and longevity.

Jewels: 17, reducing friction in critical pivots.
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Power Reserve: Approximately 40-48 hours when fully wound.

Functions: Central hours, minutes, and seconds; sweep seconds hand.

Design and Features

This hand-wound caliber features an Incabloc anti-shock system for durability and a 53-degree lift angle for efficient energy transfer. Parts like the balance (721/2007) interchange with family members such as 2641 or 2650, aiding repairs. Compared to the higher-beat 2660 (28,800 bph), the 2640 prioritizes a slimmer profile over faster motion.
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History and Usage

Introduced in the 1970s, the ETA 2640 powered vintage ladies’ models from brands like Omega and Tissot, though specific watches vary. Its manual winding appeals to purists, avoiding battery dependency. Spare parts remain available via specialists, supporting ongoing servicing.
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Service Considerations

Routine maintenance every 4-5 years ensures accuracy within -10/+20 seconds daily. Enthusiasts value its robustness, with NOS components cross-compatible across 26XX series—always verify with suppliers. This movement underscores ETA’s legacy in accessible, high-quality horology.

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The ETA 2641 is a compact manual-wind mechanical movement produced by ETA SA Manufacture Horlogère Suisse from 1971 to 1980, ideal for ladies’ watches. Known for its reliability within the 26XX family, it features a date complication, distinguishing it from base models like the 2640.
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Key Specifications

Size: 7.75 lignes (17.5 mm diameter, 3.5 mm height); mounting diameter 17.2 mm.

Jewels: 17.

Frequency: 21,600 vph (3 Hz) with 53° lift angle.

Power Reserve: Approximately 48 hours.

Functions: Hours, minutes, seconds, date.

Design and Features

This Swiss-made movement uses Incabloc shock protection and shares parts interchangeability with siblings like 2640, 2648, and 2650, such as balance staff #721/2007 or #723. The date corrector (part #002495) allows quick adjustment, enhancing serviceability. Its slim profile suits vintage dress watches from brands like Omega or Tissot.

​Service and Parts

Spare parts remain available through specialists, with many 26XX components cross-compatible, though beat rate and complications require verification. Routine servicing every 4-5 years preserves accuracy, typically ±10-20 seconds/day when regulated.

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The ETA 2650 is a compact automatic mechanical watch movement renowned for its reliability in ladies’ timepieces. Produced by ETA SA Manufacture Horlogère Suisse, it exemplifies Swiss precision engineering with a small footprint ideal for slim cases.

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Key Specifications

Size: 7 3/4 lignes (17.2 mm diameter), 4.3 mm thick, with overall height to hand pinion at 6.0 mm.
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Jewels: 17, reducing friction for smooth operation.

Beat rate: 21,600 vibrations per hour (3 Hz), ensuring accurate timekeeping.

Lift angle: 53 degrees.

Power reserve: Approximately 30-40 hours.

Design and Features

This self-winding caliber uses a pallet lever escapement and nickel annular balance for stability. It supports hour, minute, and sweep seconds hands (requiring 1.35 mm hour, 0.85 mm minute, 0.25 mm second pins), with a Tap 10 stem. Skeletonized variants like the 2650-S reveal intricate gears, appealing to enthusiasts. Primarily manual-wind capable with automatic winding via a bi-directional rotor, it suits vintage-inspired women’s watches.

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The ETA 2651 is a reliable automatic watch movement from ETA, a cornerstone of Swiss horology. Produced primarily in the 1970s, it powers vintage timepieces with precision and durability.

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Key Specifications

Diameter and Height: 7.5 lignes (17.2 mm wide, 4.80 mm thick), ideal for slim dress watches.
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Jewels: 21, reducing friction for smooth operation.

Beat Rate: 21,600 vibrations per hour (6 beats per second), a slower variant of the ETA 2671’s 28,800 vph for enhanced longevity.

Functions: Sweep seconds, quickset date at 3 o’clock.

Design and Features

This self-winding caliber uses a central rotor for bidirectional winding, ensuring consistent power reserve around 42 hours. Incabloc shock protection safeguards the balance staff during impacts. Often signed by brands like Roamer, it features standard ETA finishing with blued screws and perlage.

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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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