The ETA 2801-2 is a reliable hand-wound mechanical movement from ETA, renowned in horology for its precision and simplicity. Introduced around 1982 as part of the ETA 2800 family, it powers classic timepieces with hour, minute, and central seconds hands. This 11.5 ligne caliber measures 25.6mm in diameter and 3.55mm thick, making it versatile for slim dress watches.
Key Specifications

Jewels: 17, reducing friction for longevity.

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

Power Reserve: Approximately 42 hours when fully wound.

Functions: Hacking seconds for precise time-setting; no date complication.

Winding: Manual, clockwise via crown; balance at 12 o’clock position.

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The ETA 2804 is a reliable manual-wind mechanical movement from ETA’s Mecaline family, prized for its precision in vintage and modern Swiss watches.

​Overview

Introduced as an update to the original ETA 2804, the Caliber 2804-2 features a compact 11½ ligne (25.60 mm) diameter and 3.35 mm height, making it ideal for slim dress watches. It operates at 28,800 beats per hour (4 Hz) with 17 jewels, ensuring smooth sweeping seconds and a power reserve of about 40 hours. This hand-winding caliber serves as the date-equipped variant of the ETA 2801-2, sharing DNA with popular automatics like the 2824-2 and 2836-2.
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Key Features

Manual Winding: Stem-wound with direct sweep seconds hand; hand sizes 1.50/0.90/0.25 mm (H/M/S).

Date Complication: Quickset date at 3 o’clock with semi-instantaneous change and hacking seconds option.

Shock Protection: Incabloc system for durability; bimetallic screw balance and Breguet hairspring for stability.

Finishing: Standard ETA quality with potential for Elabore or Top grades in higher-end models.

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The ETA 2804-1 is a reliable manual-wind mechanical movement from ETA SA, a Swatch Group subsidiary renowned for precision Swiss calibers. Produced as part of the Mecaline series, it powers numerous vintage and entry-level watches with its compact design and consistent performance.
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Key Specifications

Diameter: 25.6 mm (11.5 lignes), fitting standard 38-42 mm cases.

Height: 3.35 mm, ideal for slim profiles.

Jewels: 17, reducing friction in critical pivots.

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

Power Reserve: 42 hours when fully wound.

Design and Features

This three-hand movement (hours, minutes, sweep seconds) lacks date or automatic winding, emphasizing simplicity and serviceability. It uses Glucydur balance and Breguet hairspring for shock resistance via Incabloc system. Direct seconds at 9 o’clock enhances balance wheel visibility, appealing to enthusiasts.

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History and Usage

Introduced in the 1970s, the 2804-1 evolved from ETA’s workhorse lineup, similar to the automatic 2824-2 but manual. Brands like Tissot, Omega (early models), and independents adopted it for dress watches. Production phased out post-2000s amid Swatch’s Powermatic shift, but spares remain abundant.
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Advantages for Collectors

Affordable servicing (parts widely available).

High beat rate for accuracy (±12 sec/day).

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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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