The ETA 2390 is a classic mechanical manual-wind movement known for its reliability and widespread use in vintage Swiss watches. Introduced in the mid-20th century, it remains a favorite among collectors and watchmakers for its robust design and straightforward mechanics.
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Key Features

Movement Type: Mechanical, manual-wind

Diameter: 10.5”’ (23.2–23.7 mm)

Height: 3.6 mm

Jewels: 17

Frequency: 18,000 vibrations per hour (2.5 Hz)

Power Reserve: Approximately 47 hours

Lift Angle: 52°

Regulation: Features a screw balance and Swiss lever escapement; later versions include an annular (screw-less) balance

Seconds: Direct central sweeping seconds

Hairspring: Early models have a fixed stud-holder, while later ones feature a mobile stud-holder

Notable Details

The ETA 2390 is part of a family of movements, with the ETA 2391 being a slightly larger version (11.5”’).

The movement is shock protected, ensuring durability.

It is commonly found in watches from the 1950s and 1960s, and its simple architecture makes it a popular choice for restoration and repair projects.
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Bullet Points

Manual-wind, mechanical movement

10.5”’ diameter, 3.6 mm height

17 jewels, 18,000 vph frequency

47-hour power reserve

Screw balance, Swiss lever escapement

Central sweeping seconds

Fixed or mobile hairspring stud-holder (depending on production date)

Widely used in vintage Swiss watches

The ETA 2390 is a testament to ETA’s engineering legacy, combining practicality and reliability in a compact movement that continues to be valued by horology enthusiasts today.

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The ETA 2391 is a classic manual-wind watch movement produced by ETA, known for its slim profile and reliable performance in vintage timepieces. Designed for small to mid-sized watches, it remains a favorite among collectors and watchmakers for its straightforward construction and historical significance.

Key Specifications

Movement Type: Manual-wind, center seconds

Diameter: Approximately 26mm

Height: Just 3.6mm, making it one of the slimmer manual movements

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Jewels: 17 jewels

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

Power Reserve: Around 48 hours

Notable Features

The ETA 2391 features a simple hour, minute, and center seconds display, without complications.

Many versions were produced with variations in finishing, balance design, and shock protection, depending on the brand and era.

Some models, such as those signed by Wyler, use an “S”-shaped balance arm, which theoretically offers better shock resistance by allowing flexibility during impact.

Usage and Legacy

This movement was widely used by various brands in the mid-20th century, often found in vintage dress watches.

Its slimness and reliability made it suitable for elegant, thin cases, and it remains a sought-after movement for restoration projects.

Bulletin Points

Manual-wind movement, center seconds, 17 jewels

Diameter: 26mm, Height: 3.6mm

Frequency: 18,000 A/h, Power reserve: 48 hours

Simple, robust design, used by multiple brands

Often found in vintage dress watches, popular for restoration
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The ETA 2391 continues to be a respected movement in horology for its simplicity, slim build, and enduring appeal in vintage watch circles.

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The ETA 2408 is a vintage manual wind movement produced by ETA, a renowned Swiss manufacturer, and is celebrated for its reliability and classic design in mechanical watches. This movement is notable for its manual winding mechanism, sweep second hand, and date complication, making it a favorite among vintage watch enthusiasts and collectors.
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Key Features

The ETA 2408 is a manual wind caliber, typically featuring 17 or 21 jewels depending on the variant.

It has a diameter of 25.60 mm and a height of 3.60 mm, making it suitable for a range of watch cases.

The movement operates at a frequency of 18,000 vibrations per hour (A/h), which is standard for many vintage movements.

It offers a power reserve of approximately 47 hours, providing reliable timekeeping between windings.

The date display is set by changing the time, and the movement uses a new date mechanism compared to earlier ETA manual wind calibers.

Technical and Historical Notes

The ETA 2408 was introduced in the 1940s and is part of a family that includes the 2390, 2391, and 2406, each with minor differences in design and function.

The movement is known for its robust construction and ease of servicing, which has contributed to its enduring popularity among watchmakers.
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Spare parts for the ETA 2408 are still available, though some components like the balance bridge and complete balance may be sold separately.

Bulletin Points

Manual wind movement with sweep second and date function.

17/21 jewels, 25.60 mm diameter, 3.60 mm height.

18,000 A/h frequency, 47-hour power reserve.

Classic design, easy to service, widely used in vintage watches.
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Available spare parts support restoration and repair.

The ETA 2408 remains a respected movement for vintage watch restoration and mechanical watch aficionados, reflecting the enduring legacy of Swiss watchmaking.

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The ETA 2412 is a classic manual-wind watch movement from ETA, notable for its compact size and use in ladies’ watches during the 1950s and 1960s. This movement is recognized for its innovative design and reliability, making it a favorite among vintage watch collectors and restorers.
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Key Features

The ETA 2412 has a diameter of 6 3/4 lignes, making it one of the smallest movements of its era.

It beats at 21,600 vibrations per hour (A/h) and features a 17-jewel configuration for smooth operation.

The movement uses a yoke winding system and incorporates Incabloc shock protection for durability.

Its minute hand is driven indirectly by the train of the second wheel, allowing for a larger mainspring and balance wheel, which improves running time and precision.

Technical Details

Escapement: Pallet lever

Balance types: Glucydur screw balance and nickel annular balance

Hairspring direction: Clockwise

Adjustable via hairspring key

Moveable stud for fine timing adjustments

Produced from 1955 onward, often found in unbranded or de luxe models.

Notable Highlights

The Glucydur screw balance version is visually striking and offers enhanced timing accuracy.

The movement is sometimes known as Dugena 1201 when used in watches by Dugena.

It is frequently encountered in vintage ladies’ watches and is prized for its compact size and elegant construction.

The ETA 2412 remains a respected movement among horology enthusiasts for its engineering and historical significance in the world of vintage mechanical watches.

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The ETA 1216 is a vintage automatic mechanical watch movement renowned for its reliability and widespread use in mid-20th-century Swiss timepieces. Produced from 1969 to 1982, it powered over 25 million units across various brands, featuring day-date complications and a precision Triovis regulator.
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Key Specifications

Size: 9.25 lignes (20.8 mm diameter, 5.3 mm height)

Jewels: 17

Frequency: 18,000 vph

Power Reserve: 39 hours

Functions: Sweep seconds, day-date (quick-set at 21:15-24:00), optional hack mechanism

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ETA Watch Co.: The Cornerstone of Swiss Watch Movement Manufacturing

ETA SA is a historic and dominant Swiss watch movement manufacturer, whose roots trace back to the mid-19th century. It is widely recognized for supplying reliable, precise, and affordable mechanical and quartz movements to numerous renowned Swiss watch brands and is a wholly owned subsidiary of the Swatch Group.
Key Highlights

Founded: Officially established in 1932 as ETA SA, but its origins date back to 1856 in Grenchen, Switzerland, when Urs Schild, a schoolmaster, and Dr. Joseph Girard founded a watch movement factory that later became Eterna and eventually evolved into ETA