The ETA 2540 is a compact manual-wind movement from the Swiss manufacturer ETA, renowned for its reliability in vintage ladies’ watches. Produced from 1965 to 1972, it served as the base model for the 2540 series, emphasizing precision in slim cases.

​Key Specifications

Size: 7¾ lignes (approximately 17.2 mm diameter), ideal for women’s timepieces.

Jewels: 17, reducing friction in critical components.

Beat Rate: 21,600 vibrations per hour (vph), with a 44-hour power reserve.

Features: Sweep seconds hand driven directly from the center, Incabloc shock protection, and movable balance stud for fine regulation.

Design and Functionality

Engineers designed the ETA 2540 with a Swiss lever escapement and stem-winding/setting mechanism, ensuring smooth operation in small formats. Its direct-driven center seconds provide fluid motion without a sub-second complication, enhancing readability in dress watches. The movement’s simplicity made it a staple for brands like Golana, with new old stock (NOS) units still available today.
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Historical Context

ETA introduced the 2540 amid the rise of compact mechanical calibers, predating quartz dominance. It powered elegant vintage pieces, prized by collectors for serviceability and parts availability. Though discontinued, its legacy endures in horology, with variants like automatic upgrades in later series.

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The ETA 2541 is a reliable manual-wind mechanical watch movement from the renowned Swiss manufacturer ETA SA, produced primarily in the mid-20th century.
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Key Specifications

Size and Jewels: 7 3/4 lignes diameter with 21 jewels for reduced friction and longevity.

Beat Rate: 21,600 beats per hour (BPH), enabling smooth sweep seconds hand motion.

Functions: Central sweep seconds and date window at 3 o’clock; date quick-set by advancing time past 21:20-24:00.

Shock Protection: Incabloc system safeguards the balance from impacts.

Hand Sizes: Hour 70/120, minute 120, seconds 22 for standard compatibility.

Design and Performance

This compact caliber suits dress watches and vintage models, offering a power reserve of about 42-46 hours when fully wound. Its nickel-plated finish enhances durability, while the elaborate construction supports precise regulation. Common in mid-range Swiss timepieces, it emphasizes ETA’s tradition of robust, serviceable movements.

Common Repairs and Parts

Endshake Issues: Fourth wheel excess play can contact the third wheel, halting operation; requires careful adjustment.

Available Spares: Ratchet wheel (part 425), date indicator maintaining plate (small version), and click components remain accessible for restorers.

​Servicing Tips: Use tools like Horotec for balance and stud work; compatible with ETA 2540 family parts.

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The ETA 2550 is a vintage automatic mechanical watch movement produced by ETA, a renowned Swiss manufacturer, primarily during the 1960s and early 1970s. Known for its reliability in mid-range timepieces, it features a sweep second hand and robust construction suitable for everyday wear. This caliber exemplifies ETA’s early automatic innovations, blending functionality with durability.
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Key Specifications

Type: Automatic self-winding with ball-bearing rotor for smooth winding.

Functions: Hours, minutes, sweep seconds; some variants include day-date complications adjustable via crown.

Jewels: Typically 25, reducing friction in critical pivots.

Frequency: 18,000 vibrations per hour (2.5 Hz), offering a balance of accuracy and longevity.

Power Reserve: Approximately 40-45 hours when fully wound.

Historical Context

Introduced around 1955-1965, the ETA 2550 powered various dress and sports watches from brands like Omega, Tissot, and Longines until about 1972. Its shock protection system, often Incabloc, enhanced resistance to daily impacts. Production ceased as ETA shifted to higher-beat calibers like the 2824, but spares remain available for restoration.
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Technical Highlights

Dimensions: 11.75 lignes (26mm diameter), height around 4.6mm, fitting standard cases.

Rotor: Bidirectional winding via peripheral ball-bearing for efficiency.

Date Mechanism: Quick-set via +/-24-hour adjustment; reliable but manual.
The movement’s simplicity aids repairs, with parts like pallet forks and balance staffs widely cataloged.

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The ETA 1721.1 is a notable Swiss mechanical movement, produced from 1976 to 1983, and widely used in ladies’ watches due to its compact size and reliable performance. This movement is highly regarded for its indirect minute drive, which allows for a larger balance and mainspring barrel, improving accuracy and power reserve.
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Key Features

17 jewels for smooth operation and durability.

Indirectly driven minute hand for better balance and increased runtime.

Nickel annular balance wheel for stable timekeeping.

Pallet lever escapement for consistent performance.

Incabloc shock protection for added resilience.

Clockwise balance direction and moveable stud for precise adjustment.
Yoke winding system for efficient manual winding.

Technical Details

Diameter: 7 3/4” (approximately 17.2mm).

Frequency: 21,600 vibrations per hour (3 Hz).

Production period: 1976–1983.

Setting lever spring: 2 holes.
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Bulletin Points

17-jewel movement for reliability.

Indirect minute drive for improved power reserve.

Nickel annular balance for stable timekeeping.

Incabloc shock protection.

Manufactured between 1976 and 1983.
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The ETA 1721.1 stands out for its innovative design and enduring reliability, making it a favorite among vintage watch collectors and restorers. Its technical features and historical significance continue to make it a respected movement in horology.

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The ETA 2000.1 is a compact and elegant automatic movement produced by ETA SA, widely recognized for its reliability and precision in Swiss watchmaking. Introduced in the early 1990s, this movement is particularly favored for its slim profile, making it a popular choice for women’s watches and other small timepieces.
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Key Features

The ETA 2000.1 measures just 3.6 mm in height, making it one of the thinnest automatic movements available.

It features central hours, minutes, and sweeping seconds, along with a date function at 3 o’clock that can be quickly set.

The movement has hacking seconds, allowing for precise time setting.

It is powered by the motion of the wearer’s wrist and offers a 40-hour power reserve.

Technical Specifications

Diameter: 19.4 mm

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

Jewels: 20

Country of manufacture: Switzerland

Applications and Reputation

The ETA 2000.1 is frequently used in luxury and mid-range brands, including Movado (e.g., Elliptica models) and other manufacturers seeking a reliable, thin automatic movement.

Its slim design and accurate timekeeping make it suitable for dress watches and jewelry-style timepieces.

The movement is Swiss-made, reflecting ETA’s long-standing reputation for quality and durability.
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The ETA 2000.1 continues to be a respected movement in the watch industry, especially for those who value elegance and reliability in a compact automatic caliber.

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The ETA 2004.1 is a reliable automatic mechanical movement widely used in Swiss and international watch brands. Known for its robustness and accuracy, the ETA 2004.1 has become a staple in many mid-range and entry-level mechanical watches, appreciated for its balance of performance and affordability.
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Key Features of ETA 2004.1

Movement Type: Automatic (self-winding)

Diameter: 23.30 mm (10 1/2’’’)
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Thickness: 5.50 mm

Jewels: 20

Power Reserve: Approximately 40 hours

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

Bulletin Points

The ETA 2004.1 is designed for analog display watches, making it suitable for classic and modern designs alike.

It is part of ETA’s long-standing tradition of producing high-quality, mass-produced movements that are easy to service and repair.

The movement is often used by brands looking for a dependable base caliber that can be customized with different complications and finishes.

Due to its compact size and efficient automatic winding system, the ETA 2004.1 is favored in slim dress watches and smaller cases.

It is compatible with a wide range of spare parts, which simplifies maintenance and repairs for watchmakers.
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Conclusion

The ETA 2004.1 remains a popular choice for watchmakers and brands seeking a dependable, serviceable, and versatile automatic movement. Its specifications and widespread availability ensure it continues to be a cornerstone in the world of mechanical watches.

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The ETA 2094 is a compact automatic chronograph movement designed for smaller watches, particularly ladies’ timepieces, offering a blend of precision and practicality in a reduced size.
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Key Features

The ETA 2094 is part of ETA’s Mecaline Specialty line, introduced in 2003, and is based on the ETA 2004-1 platform.

It features an automatic winding system, 33 jewels, and operates at a frequency of 28,800 vibrations per hour (4 Hz), ensuring reliable timekeeping.

The movement is compact, with a diameter of 23.3 mm and a height of 5.5 mm, making it suitable for watches with limited case space.

It includes a date display function, commonly referred to as “DATE4” in technical specifications.

The power reserve is approximately 37 hours, which is typical for movements of this size and complexity.

Usage and Status

The ETA 2094 was primarily used in smaller chronograph watches, especially those designed for women, due to its size and aesthetic appeal.

As of recent years, the caliber has been phased out by ETA, meaning it is no longer in active production but remains a sought-after movement among collectors and for vintage watch restoration.

Notable Points

The movement’s compact design makes it a preferred choice for brands seeking to fit an automatic chronograph in a smaller case without sacrificing functionality.

It is visible through transparent case backs in some models, showcasing its craftsmanship and custom rotor designs.

The ETA 2094 is a testament to ETA’s engineering expertise in creating specialized movements for niche watch designs.

This movement continues to be valued in the horological community for its blend of technical innovation and elegant design, especially in vintage and specialty timepieces.

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The ETA 2360 is a classic manual-wind watch movement that played an important role in Swiss horology during the mid-20th century. It was produced by ETA from 1958 to 1967 and is known for its compact size and reliability in vintage timepieces.
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Key Features

The ETA 2360 is a hand-wound movement with a size of 7 3/4 ligne, making it suitable for smaller watches.

It features a Swiss lever escapement and a direct sweeping seconds hand, which is typical for movements of this era.

In 1964, ETA made a significant change by switching from a fixed to a mobile stud carrier, improving the movement’s performance and serviceability.

Technical Details

The movement is a base caliber, with the ETA 2363 being a closely related variant.
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It is not equipped with a calendar or date function, focusing instead on simple timekeeping.

The click spring is a critical spare part for maintenance and repair of the ETA 2360, ensuring the winding mechanism operates smoothly.

Historical Context

The ETA 2360 was used by several Swiss watch brands during its production run, often in elegant, thin dress watches.

Its compact design made it a popular choice for watches with limited case space, contributing to its reputation for reliability and precision.

Bulletin Points

Manual-wind movement produced from 1958 to 1967.

7 3/4 ligne size, suitable for small watches.

Swiss lever escapement, direct sweeping seconds.

Mobile stud carrier introduced in 1964.

No calendar complication; simple time-only display.

Click spring is a vital spare part for servicing.

The ETA 2360 remains a respected movement among vintage watch collectors and restorers for its historical significance and mechanical simplicity.

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The ETA 2370 is a classic manual-wind movement introduced by ETA in the early 1950s, marking a pivotal point in Swiss watchmaking history. It served as the direct forerunner to the famous ETA 2390 series and remains a favorite among vintage watch enthusiasts for its robust construction and elegant design.
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Key Specifications

Size: 11 1/2”’ (approximately 25.5 mm diameter)

Height: 4.15 mm

Frequency: 18,000 vibrations per hour (A/h)

Lift Angle: 52.23°

Jewels: 17

Power Reserve: 49 hours

Escapement: Swiss pallet lever

Shock Protection: Incabloc

Notable Features

Indirectly driven hands via the third wheel pinion, allowing for a larger balance and mainspring barrel

Yoke winding system for smooth manual winding

Glucydur screw balance for high precision

Long regulator arm for fine frequency adjustment

Hack feature (stops seconds hand when setting time)

Historical Context

The ETA 2370 was among the first movements to feature modern construction techniques, such as indirectly driven hands and a solid 11 1/2 ligne layout. Its design set the stage for later ETA calibers and contributed to the company’s reputation for reliability and precision.

Usage and Legacy

Predominantly used in the 1950s and 1960s, the ETA 2370 powered a variety of classic watches. Its solid build, Incabloc shock protection, and beautiful Glucydur balance make it a sought-after movement for restoration and collection.

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