The ETA 2870 is a reliable automatic movement from the ETA 2800 family, prized in vintage Swiss watches for its robustness. Produced primarily in the 1970s-1980s, it powers mid-range timepieces with smooth sweeping seconds.

​Key Specifications

Type: Automatic self-winder with central rotor and bi-directional winding.

Dimensions: 11.5 lignes (25.60mm diameter), 5.35-5.50mm thick.

Jewels: 17, 21, or 25, depending on grade.

Beat rate: 28,800 A/h (4Hz) for precise timekeeping.

Power reserve: Approximately 38-44 hours.

Functions and Features

This movement offers hours, minutes, central sweep seconds, and often a date complication. It supports hand-winding and features like Incabloc shock protection in higher grades. Part of ETA’s workhorse 2800/2824 lineage, it shares DNA with modern staples but in a slimmer profile suited for dress watches.

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The ETA 2872 is a reliable vintage automatic watch movement from the ETA 2800 family, produced starting in the 1970s.
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Overview

Introduced as an economical alternative to the popular ETA 2824-2, the 2872 features a self-winding mechanical design with a central rotor. It measures 11.5 lignes (25.6mm diameter) and 5.35-5.5mm thick, making it suitable for mid-sized dress watches. Production emphasized Swiss-made quality with Incabloc shock protection and ball-bearing rotor for smooth operation.
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Key Specifications

Beat Rate: 28,800 vibrations per hour (4 Hz) for smooth sweeping seconds

Jewels: 17/21/25, reducing friction in critical pivots

Power Reserve: Approximately 38-44 hours

Lift Angle: 52-53 degrees

Functions: Hours, minutes, sweeping seconds, quickset date at 3 o’clock

Variants and Features

The 2872 supports hand-winding and offers optional hacking (seconds stop when setting time), upgradable via a stop lever part. Related calibers include the slower 2873 (21,600 bph), manual-wind 2852, and siblings 2870/2878 with minor differences in jewels or hacking. Dial feet positions match broader ETA 2800 series for easy case compatibility.

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The ETA 2873 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, introduced in the 1970s. Known for its simplicity and ETA quality, it powers vintage timepieces with a sweep second hand and quickset date.

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Key Specifications

Diameter: 25.60 mm (11.5 lignes)

Height: Approximately 4.6 mm

Jewels: 17, 21, or 25 variants

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

Power Reserve: Around 42 hours

Winding: Bi-directional automatic with central rotor

Features and Design

This mass-production caliber emphasizes durability over complexity, featuring automatic winding and a quickset date for user convenience. Variants offer different jewel counts for grades like standard or elaboré. It debuted as a workhorse for mid-range Swiss watches, showing ETA’s hallmark precision.

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Usage in Watches

The ETA 2873 appears in vintage models from brands like Titus, valued for accuracy in daily wear. Its 1970s design bridges manual and modern automatics, remaining serviceable today. Collectors appreciate its role in horological history amid ETA’s shift to in-house calibers.

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The ETA 2878 is a reliable vintage automatic watch movement from the Swiss manufacturer ETA, introduced in the 1970s as part of the economical 2800 series. Known for its robustness and bilingual day-date complication, it powers numerous mid-range watches with precise timekeeping.
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Key Specifications

Diameter: 25.6mm (11.5 lignes)

Thickness: 5.35-5.5mm

Jewels: 17/21/25 (depending on grade)

Beat Rate: 28,800 vph (4 Hz)

Power Reserve: ~38 hours

Lift Angle: 52 degrees
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Features and Functions

This self-winding mechanical caliber includes central hours, minutes, sweeping seconds, and a quick-set day-date window at 3 o’clock, with instantaneous changeover at midnight. It supports hand-winding, features Incabloc shock protection, and a ball-bearing rotor for bi-directional winding. Hacking capability is optional via a stop lever (part 9433), allowing seconds-hand stop for precise setting.
Comparisons

Vs. ETA 2879: Higher beat rate (28,800 vs. 21,600 vph) for smoother sweep.

Siblings: Related to 2870/2872 (similar but varied jewels/functions); manual-wind counterpart is 2858.
Dial feet positions match modern ETA 2824-2, easing retrofits.

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The ETA 2879 is a reliable automatic mechanical watch movement produced by ETA SA, introduced around 1968 as part of the interchangeable “Gabarit” family alongside FHF calibers. Known for its sturdy construction and low profile of 5.50 mm, it measures 25.60 mm in diameter (11.5 lignes) and beats at 21,600 vibrations per hour. This movement powered various mid-range watches in the 1970s, featuring day-date complications with bilingual day wheels and instant change mechanisms.
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Key Specifications

Jewels: 17, 21, or 25 depending on variant, with Diafix settings for the escape wheel and third wheel enhancing precision.

Functions: Automatic bi-directional winding via central rotor, sweep seconds, quickset date at 3:00, day window at 3:00, and hacking seconds.

Technical Features: Indirectly driven minute hand, large balance at 12:00, barrel at 7:30, Incabloc shock protection, adjustable stud holder, and counter-clockwise balance cock.

Power Reserve: Approximately 42-50 hours, hand-windable option available.
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Design and Production

The ETA 2879 integrated its winding gear directly, unlike add-on automatics, creating a robust, low-profile unit ideal for dress watches. Part of the short-lived 1970s ETA 2850 series (time-only: 2851/2850; date: 2853/2852; day-date: 2859/2858/2879/2878), production ended after a few years due to market shifts. Variants like ETA 2878 offered manual winding at the same frequency.

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The ETA 2890 is a renowned slim automatic watch movement from ETA, part of the Swatch Group’s flagship lineup, celebrated for its reliability and versatility in luxury timepieces.

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History and Development

Introduced in 1975, the ETA 2890 family evolved from Eterna’s Cal. 1466U, incorporating innovations like ball bearings on the rotor and a compact balance wheel for superior performance over the ETA 2800 series. Updated versions, such as the 2892A2 in 1996, improved winding efficiency with an extra jewel and larger rotor mass. Production shifted post-2021, with Sellita’s SW300 clones replacing it outside Swatch Group.
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Key Specifications

Dimensions: 25.6mm diameter, ultra-thin 3.6mm height for elegant cases.

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

Jewels: 21, reducing friction for longevity.

Power Reserve: 42 hours, with bi-directional automatic winding via central rotor.
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Features: Three-hand display (no date in base 2890); balance at 12:00 position with eccentric regulation.
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Variants and Applications

The family includes the date-equipped 2892-2/A2 (most popular), small seconds 2895-2, GMT 2893-2, and modular additions like power reserve (2897) or perpetual calendar (2890A9). Commonly found in brands like Omega, TAG Heuer, and IWC for dress and complication watches due to its slim profile and accuracy.

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The ETA 2892 is a renowned thin automatic movement from ETA, prized for its reliability and precision in luxury watches.
History

Introduced in the 1970s by ETA (part of Swatch Group), the original ETA 2892 evolved from earlier calibers like the 2890, addressing winding efficiency issues during the quartz crisis. The upgraded 2892-A2 variant arrived around 1996, shrinking from 28mm to 25.6mm diameter while boosting rotor mass for better performance. Production continued until 2021 for non-Swatch brands, cementing its legacy in high-end timepieces.

​Key Specifications

Size and Jewels: 11½ lignes (25.6mm diameter), 3.6mm thick, 21 jewels.

Frequency and Power: 28,800 bph (4 Hz), 38-42 hour reserve.

Features: Self-winding bidirectional rotor, hacking seconds, instant date at 3 o’clock, Incabloc shock protection.

Grades and Accuracy

Available in Elaborated, Top, and COSC chronometer grades, with adjustments from 4-6 positions for daily rates of -4/+6 to +/-20 seconds. The 2892-A2 excels in upscale models due to its smooth sweep and reliability.

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The ETA 2892-A2 is a renowned Swiss automatic watch movement from ETA, prized for its slim profile and precision in upscale timepieces.

Key Specifications

Dimensions: 25.6mm diameter, 3.6mm height—ideal for thin dress watches.

Jewels: 21, reducing friction for longevity.

Beat Rate: 28,800 vibrations per hour (4Hz) for smooth seconds hand sweep.

Power Reserve: 42 hours with bi-directional ball-bearing rotor.

Functions: Hours, minutes, sweeping seconds, date (at 3 o’clock); hacking seconds and quickset date.

Evolution and Design

Introduced around 2000 as an upgrade to the ETA 2892-2, the 2892-A2 features a monobloc frame for enhanced stability, Incabloc shock protection, and ETACHRON regulator. It addressed earlier models’ winding efficiency issues from a stronger mainspring and higher beat rate, using a refined automatic system. Lift angle of 51 degrees ensures consistent performance.

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The ETA 2892-2 is a renowned Swiss automatic watch movement from ETA, celebrated for its slim profile and reliability in luxury timepieces.
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Overview

Introduced in the early 1980s as part of the ETA 2890 family, the 2892-2 evolved into the refined 2892A2 around 2000, maintaining key specs like 25.6mm diameter and 3.6mm height. This self-winding caliber powers brands from IWC to Omega, offering a thinner alternative to the workhorse ETA 2824-2. It beats at 28,800 vph (4 Hz) with 21 jewels and a 42-hour power reserve.
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Key Specifications

Dimensions: 11.5 lignes (25.6mm diameter), 3.6mm thick for slim cases.

Functions: Central hours, minutes, sweeping seconds; date at 3 o’clock; hand-windable and hacking seconds.

Technical Features: Bi-directional rotor on ball bearings, Incabloc shock protection, ETACHRON regulator, 51-degree lift angle.

Accuracy Grades: Elaboré (±5-20 sec/day, 4 positions); Top (±4-15 sec/day, 5 positions); Chronometer (COSC, -4/+6 sec/day).

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