The ETA 2428 is a classic Swiss automatic movement introduced in 1956, known for its reliability and historical significance in the world of mechanical watches. This movement operates at a frequency of 21,600 vibrations per hour (3 Hz), making it a robust option for vintage and classic timepieces.
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Key Features

The ETA 2428 is an automatic caliber, not featuring a ball bearing or gold rotor, distinguishing it from some other ETA models.

It incorporates an indirectly driven minute hand, allowing for a larger balance wheel, which contributes to improved timekeeping stability.

The movement shares design similarities with the Eterna 1419U and is part of a broader series that includes manual wind variants.

Technical Specifications

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

Power Reserve: Approximately 38–42 hours depending on variant and usage

Balance: Larger balance due to indirect minute drive

Shock Protection: Standard Swiss shock protection system

Bulletin Points

Introduced in 1956, the ETA 2428 is a milestone in Swiss automatic movement development.

Notable for its robust construction and compatibility with vintage watches.

The indirectly driven minute hand allows for a larger balance, enhancing stability.

Operates at 3 Hz, which is lower than the more common 4 Hz found in later ETA movements.

Still sought after by collectors and restorers for its historical value and reliability.

The ETA 2428 remains a respected movement for vintage watch enthusiasts and professionals seeking authentic mechanical calibers for restoration projects.

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The ETA 2442 is a compact manual-wind movement, widely recognized for its reliability and classic design. This caliber is often found in vintage watches and is valued by collectors and restorers for its precision and small size.
Key Specifications

Movement type: Manual wind

Diameter: 13.75 mm (6”’ ligne)

Height: 3.2 mm

Jewels: 17

Frequency: 21,600 vibrations per hour (vph)

Power reserve: Approximately 41 hours

Lift angle: 53°

Minute hand: Indirectly driven

Features and Usage

The ETA 2442 is known for its robust construction and is commonly used in smaller dress watches due to its compact dimensions.

It is a direct competitor to other small manual movements and has been adopted by several watch brands, including Junghans (as the 661 caliber).

The movement is suitable for restoration projects and is still available as a spare part for vintage watch repairs.

Common Spare Parts

Barrel (drum and cover), center wheel, third wheel, fourth wheel, escape wheel, balance staff, pallet fork, crown wheel, and various springs.

Summary

The ETA 2442 remains a staple in the world of vintage mechanical watches, offering a blend of precision, durability, and compactness. Its manual winding mechanism and indirect minute hand drive make it a favorite among watchmakers and enthusiasts restoring classic timepieces.

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The ETA 2450 is a classic mechanical watch movement produced by ETA, a Swiss manufacturer renowned for its reliable and widely used calibers. This movement is part of the ETA 2390/2450 family and is known for its versatility and robust construction, making it a popular choice among watchmakers and collectors alike.
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Key Features

The ETA 2450 is available in both manual wind and automatic (central rotor) versions, providing flexibility for different watch designs.

It comes in two sizes: 10.5 ligne and 11.5 ligne, allowing it to fit a range of case dimensions.

The movement can be found with or without a date function, depending on the variant.

It is recognized for its durability and ease of servicing, which has contributed to its longevity in the watch industry.

Technical Details

The ETA 2450 is a small, compact movement, making it suitable for smaller watches and dress watches.

It typically operates at a frequency of 18,000 vibrations per hour (vph), ensuring good timekeeping accuracy for its era.

The movement’s modular design allows for straightforward replacement of parts, including the barrel bridge and oscillating weight.

Historical Significance

The ETA 2450 has been used by numerous watch brands, particularly in the 1970s and 1980s, and is still valued for its reliability and repairability.

Its design has influenced later ETA movements, and spare parts remain available for restoration and repair work.

The ETA 2450 remains a respected movement among horologists for its adaptability, durability, and historical importance in Swiss watchmaking.

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The ETA 2451 is a classic automatic watch movement developed by ETA in the early 1940s, marking a significant step in the evolution of Swiss automatic calibers. It is recognized for its robust construction, bidirectional winding system, and reliability, making it a favorite among vintage watch collectors and restorers.

​Key Features

The ETA 2451 features an 11 1/2”’ (25.6mm) diameter and a height of 5.2–5.3mm, making it suitable for a wide range of case sizes.

It operates at a frequency of 18,000 vibrations per hour (A/h), with a typical power reserve of around 42 hours.

The movement is equipped with 21 jewels, though some variants may have 17, 25, or 30 jewels.

It uses a Swiss pallet lever escapement and a Glucydur balance wheel, often protected by Incabloc shock absorbers.

Construction and Operation

The ETA 2451 is known for its flat construction and center seconds display, achieved through a gear train that drives the seconds wheel directly.

The movement employs a yoke winding system, allowing bidirectional winding of the mainspring via a hollow conical axle and pawl changer wheels.

The hands are driven indirectly from the dial side, a design feature that persists in modern ETA movements.

The self-winding module is removable for servicing, and the oscillating weight is axle-beared, winding in both directions.

Historical Significance

Introduced in 1942, the ETA 2451 served as a pilot series for the family 690 through 699, influencing the design of later ETA calibers.

Its production period spanned from the 1940s into the 1970s, making it a staple in many vintage Swiss watches.

Bulletin Points

Automatic movement with bidirectional winding.

Diameter: 25.6mm, Height: 5.2–5.3mm.

Frequency: 18,000 A/h, Power reserve: 42 hours.

Jewels: 17–30 (depending on variant), typically 21.

Swiss pallet lever escapement, Glucydur balance, Incabloc shock protection.

Indirect hand driving, removable self-winding module.
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The ETA 2451 remains a benchmark for vintage automatic movements, appreciated for its durability and influence on modern Swiss watchmaking.

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The ETA 2453 is a notable automatic mechanical movement from ETA, widely used in mid-20th century watches. This movement is recognized for its reliability, compact design, and practical complications, making it a favorite among watchmakers and collectors interested in vintage timepieces.
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Key Features

The ETA 2453 features an automatic winding system, providing convenience for daily wear.

It operates at a frequency of 18,000 vibrations per hour (vph), which was standard for its era.

The movement has a diameter of 26 mm and is 11.5 ligne, making it suitable for a variety of watch cases.

It includes a sweep second hand, day, and date display, with quickset capabilities for easy calendar adjustment.

The movement offers a stop seconds function, allowing for precise time setting.

Technical Specifications

Power reserve: Approximately 42 hours.

Jewel count: Available with 17, 21, or 25 jewels, depending on the variant.

Lift angle: 52°, which is typical for movements of this period.

Period of production: Mainly used around 1974–1975.

Practical Considerations

The ETA 2453 is valued for its robust construction and ease of servicing, making it a popular choice for restoration projects.

Its day and date complications are reliable and user-friendly, ideal for vintage watches that require functional simplicity.

Collectors appreciate the movement’s historical significance and its role in the evolution of Swiss automatic movements.

This movement remains a classic example of ETA’s engineering during the golden age of mechanical watches, combining functionality with enduring quality.

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The ETA 2472 is a classic Swiss automatic movement introduced in the early 1960s, widely used in vintage and mid-range watches for its reliability and compact design. It features a date display, semi-quickset function, and a power reserve of approximately 42 hours.
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Key Features

Self-winding movement with bidirectional winding system.

Date indication with semi-quickset feature for easy adjustment.

Central seconds hand for smooth timekeeping.

Incabloc shock protection for improved durability.

Moveable hairspring stud and long regulator arm for precise time regulation.

18,000 vibrations per hour (A/h) and 25 jewels for smooth operation.

Technical Specifications

Diameter: 25.6 mm (11.5 lignes)

Height: 5.2–5.3 mm

Power reserve: 42 hours

Production period: 1960s–1970s

Functions: Hours, minutes, central seconds, date

Historical Significance

The ETA 2472 was considered state-of-the-art in its era, praised for its compact size and robust performance. Its bidirectional winding and precise regulation made it a favorite among watchmakers and brands of the time. The movement also influenced later ETA designs and remains a sought-after caliber for vintage watch enthusiasts and collectors.

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Bulletin Points

Introduced in the 1960s, still valued for reliability.

Features date display and semi-quickset function.

Compact size and chronometer-grade potential.

Used by several watch brands, including Kienzle.

Bidirectional winding, Incabloc shock protection, and precise regulation.

The ETA 2472 stands as a testament to mid-century Swiss watchmaking ingenuity, combining practicality with precision in a compact form.

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The ETA 2480 is a vintage manual-wind mechanical movement from ETA, renowned for its reliability in mid-20th-century Swiss watches.
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Overview

Produced primarily in the mid-1900s, the ETA 2480 belongs to an early family of ETA calibers with a fixed (later mobile) stud carrier and indirect minute hand drive, enabling a larger balance wheel for improved stability. It operates at 18,000 beats per hour (bph), with a variant ETA 2482 at 21,600 bph, and measures around 11.5 lignes in diameter. This caliber powered numerous affordable Swiss timepieces, emphasizing ETA’s role in democratizing quality horology.
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Key Features

Manual Winding: No automatic rotor; powered solely by hand-winding via a crown, offering precise control and a power reserve of approximately 40-45 hours.

Jewels and Finish: Typically features 17-19 jewels, with options for elevated polishing in higher grades; uses Glucydur balance and early shock protection like Incabloc.

Regulation: Etachron system for fine adjustments, achieving daily accuracy of -10/+20 seconds in standard grades.

Size and Compatibility: Compact at 25.6mm diameter, height around 2.8mm (H280 variant), ideal for slim dress watches.

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The ETA 2490 is a manual-wind mechanical watch movement renowned for its slim profile and reliability in vintage timepieces. Produced by ETA SA, this caliber exemplifies Swiss precision engineering from the mid-20th century, often found in dress watches.

Key Specifications

Size and Type: 8.75 ligne (about 19.4mm diameter), manual wind with offset center wheel and sweep seconds hand.
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Jewels: Typically 17 jewels, reducing friction for smooth operation.

Frequency: Beats at 18,000 vibrations per hour (2.5 Hz), balancing power reserve and accuracy.

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

Design Features

The ETA 2490 stands out with its flat architecture, part of ETA’s early flatline family related to the 2890 series. It includes a small seconds subdial and features like an instantaneous date corrector in some variants. Related calibers such as 2491 and 2493 share its layout, aiding part interchangeability.
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Historical Context

Introduced in the 1950s-1960s, the 2490 powered affordable luxury watches from brands like Omega and Tissot during ETA’s dominance in movements. Its simplicity made it ideal for restoration, with spare parts like pallet forks and sweep second wheels still available today.

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The ETA 2491 is a vintage manual-wind watch movement from the Swiss manufacturer ETA, renowned for its reliability in mid-20th-century timepieces. Produced around 1965, it belongs to the compact 8.75 ligne family, offering precise timekeeping with a date complication.
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Key Specifications

Size: 8.75 lignes (diameter 19.7 mm or 19.40 mm, height 3.5 mm) – ideal for smaller dress watches.

Jewels: 17, reducing friction for smooth operation and longevity.

Frequency: 18,000 vibrations per hour (vph), balancing accuracy and power reserve.

Lift Angle: 52 degrees, optimizing efficiency in manual winding.

Features: Sweep seconds hand and date window, manual wind only (no automatic rotor).

Historical Context

Introduced in the 1960s, the ETA 2491 powered various Swiss brands during the shift from post-war mechanical dominance to emerging quartz threats. Part of the 2490 family (2490 without date), it emphasized affordability and serviceability for watchmakers. Its robust construction made it a staple in vintage repairs today.
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Modern Relevance

Enthusiasts value the 2491 for restorations, with spare parts available from specialists like watch-spares.com. Though superseded by ETA’s 28xx series, its simplicity appeals to collectors avoiding overbuilt modern calibers. Accuracy holds within +20/-10 seconds daily when serviced.

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The ETA 2500 series represents a pivotal chapter in Swiss horology, serving as a foundational automatic movement family from the 1960s and 1970s. Produced by ETA SA, these calibers laid groundwork for later icons like the ETA 2824, emphasizing reliability in mid-century watchmaking.
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Historical Context

Introduced during ETA’s expansion era, the 2500 family emerged as robust automatics for everyday luxury watches. They preceded modern workhorses, bridging manual-wind traditions with self-winding innovation amid quartz threats.

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Key Technical Features

Automatic Winding: Bidirectional rotor ensures consistent power from wrist motion.

Jewels and Beat Rate: Typically 25 jewels, operating at 21,600 vph for smooth seconds hand sweep.

Power Reserve: Around 42-45 hours, suitable for daily wear.

Size and Functions: Compact diameter (often 25.6mm), supporting hours, minutes, seconds, and date complications.

Finishes Available: Standard to chronometer grades, with adjustments in multiple positions for precision.

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