The ETA 2846 is a reliable self-winding mechanical watch movement produced by ETA SA, known for its day-date complications and compact design. Introduced around the mid-20th century and refined into the 1990s-2000s, it powers various mid-range Swiss watches, including models from Tissot and Armand Nicolet. This automatic caliber emphasizes precision and serviceability, making it popular among watch enthusiasts and repair specialists.
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Key Specifications

Size and Jewels: 11.5 ligne (25.6mm diameter), 5.2mm height; available in 17-jewel or 21-jewel (or up to 30-jewel) variants with micro-rotor for slim profile.

Functions: Hours, minutes, sweeping seconds, day at 12 o’clock, date at 3 o’clock; indirect minute drive reduces thickness.

Frequency and Power: 28,800 vph (4Hz), approximately 42-50 hour power reserve; bidirectional winding via oscillating weight.

Technical Highlights

The movement features a double excenter regulator and double jewel bearings for enhanced stability. Its base plate saw updates post-1966 for better performance. Spare parts like pallets, bridges, and stems remain widely available from suppliers, supporting long-term maintenance.
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Production and Usage

Manufactured from roughly 1965 to 2006 (with some sources citing 1991-2006 peak), the ETA 2846 influenced derivatives like Armand Nicolet’s AN2846. It suits dress and sports watches valuing affordability and robustness. Today, it’s prized in vintage restorations for its ETA pedigree.
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Maintenance Tips

Regular servicing every 5-7 years preserves accuracy. Common parts include pallet forks (57/BUL 12EBA) and regulator screws. Disassembly tutorials exist for pros, emphasizing care with the micro-rotor.

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The ETA 2764 is a manual-wind mechanical watch movement from ETA’s 2700/2770 family, renowned for its reliability in mid-20th-century timepieces. Produced between 1971 and 1978, it features a high-beat rate of 28,800 vibrations per hour (A/h), offering smooth seconds-hand sweep and precision timing. This 11.5 ligne (25.6 mm diameter) caliber measures 5.2 mm thick with 17 jewels, providing about 45 hours of power reserve.
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Key Specifications

Beat rate: 28,800 A/h for enhanced accuracy over standard 21,600 A/h siblings.

Jewels: 17, reducing friction in critical pivots.

Functions: Quickset date; no day complication (unlike paired models like 2784).

Height: Slim 5.2 mm profile suits thinner cases.

Corresponding automatic: ETA 2784, sharing design lineage.

Historical Context

Introduced amid ETA’s mass production era (over 25 million 2770-family units made 1969-1982), the 2764 powered affordable dress and sports watches from brands like Certina, Longines, and Omega variants. Its manual winding appeals to purists favoring direct barrel energy transfer. Production ceased in the late 1970s amid quartz competition, but spares remain available via specialists.

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The ETA 2769.1 is a vintage Swiss mechanical watch movement produced by ETA SA, known for its reliability in mid-range timepieces from the 1970s and 1980s.
Overview

ETA 2769.1 belongs to the ETA 2700 family, featuring a manual wind mechanism without date complications. This compact caliber measures approximately 11.5 lignes (about 25.6mm in diameter) and 3.45mm thick, making it suitable for slim dress watches. It beats at 21,600 vibrations per hour (vph) with 17 jewels, offering a power reserve of around 42 hours.

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Key Specifications

Type: Manual wind, three-hand (hours, minutes, seconds).

Frequency: 2.5 Hz (21,600 bph).

Jewels: 17, reducing friction in critical pivots.

Height: 3.45mm, ideal for thin cases.

Adjustments: Typically 3 positions for everyday accuracy (±20 seconds/day).

Design Highlights

The movement uses a Glucydur balance wheel with Breguet overcoil hairspring for stability. Its train wheel bridge (Part No. 110) and pallet bridge (Part No. 125) are robust, supporting smooth gear trains. Common in brands like Certina and Tissot, it emphasizes serviceability with interchangeable parts.

Spare Parts Availability

New Old Stock (NOS) parts like main plate (No. 100), barrel bridge (No. 105), and balance bridge (No. 121/3) remain accessible via specialists. Collectors value it for restoration projects due to its straightforward architecture.

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The ETA 2770 is a classic automatic mechanical watch movement from the Swiss manufacturer ETA, renowned for its reliability in mid-range timepieces. Produced from 1969 to 1982, it belongs to a family of over 25 million units, emphasizing ETA’s dominance in affordable Swiss horology.
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Key Specifications

Diameter and Jewels: 11.5 lignes (25.6 mm), with 17, 21, or 25 jewels depending on variant.

Beat Rate: 21,600 A/h (vibrations per hour), offering a 48-hour power reserve.

Height: 5.3 mm for base model, slimmer at 5.2 mm in some quickset versions.

Functions: Sweep seconds; paired with hand-wound ETA 2750.

Family Variants

This movement spawned numerous siblings for diverse complications:

ETA 2772: Adds date window.

ETA 2773: Date with Triovis regulator for precision.

ETA 2781/2782: Quickset date.

Day/date options like 2778/2788, up to 6.0 mm thick.
High-beat 28,800 A/h models (e.g., 2771, 2774) provided 45-hour reserve for smoother seconds.

Historical Significance

Introduced during ETA’s expansion era, the 2770 powered brands like Omega and Tissot, bridging vintage reliability with modern serviceability. Its robust design suits restoration projects, with ample spare parts availability today. Though succeeded by ETA 28xx series, it remains a benchmark for entry-level automatics.
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Servicing Notes

Routine maintenance involves demagnetization and lubrication every 5-7 years. Common issues include worn date wheels in complicated variants, fixable with ETA spares. Collectors value its workhorse status in 1970s divers and dress watches.

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The ETA 2772 is a reliable mechanical automatic watch movement from the ETA 2700 series, produced between 1969 and 1982, with millions of units made.
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Overview

This caliber evolved from the ETA 2770 base model, featuring a self-winding mechanism via a bidirectional rotor. It powers mid-range Swiss watches with hours, minutes, seconds, and date functions. Known for its robust gear train and standard ETA layout, the movement measures about 11.5 lignes (25.6mm diameter) and offers around 38-42 hours of power reserve.
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Key Specifications

Type: Automatic, mechanical

Jewels: 25

Frequency: 21,600 vph (3 Hz)

Functions: Central seconds, date at 3 o’clock

Height: Approximately 5.25mm

Production Volume: Over 25 million units

Design Highlights

The ETA 2772 uses an indirect drive for hands via the third wheel on the dial side, with a large mainspring barrel for stable power. It includes common spare parts like the oscillating weight (1143), balance complete (721), and date corrector components, making servicing straightforward for professionals. Its predecessor status to modern ETA calibers underscores its influence on reliable workhorse movements.

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The ETA 2773 is a reliable automatic watch movement from the Swiss manufacturer ETA, part of the 2700 series produced from the late 1960s to the early 1980s.
Overview

Introduced around 1969, the ETA 2773 belongs to a family that powered millions of timepieces, emphasizing durability and affordability for mid-range watches. This self-winding caliber features a sweep seconds hand and a date function at the 3 o’clock position, without quickset capability, making it a workhorse for brands like Rado. With 25 jewels and a beat rate of 21,600 vibrations per hour (3 Hz), it delivers smooth operation and a power reserve of about 40-42 hours.
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Key Specifications

Dimensions: 11.5 lignes (26mm diameter), 4.6mm thick, suitable for versatile case sizes.

Functions: Hours, minutes, central sweep seconds, date window.

Winding: Automatic via bidirectional rotor; manual winding supported.

Shock Protection: Incabloc system for robustness.

Frequency: 21,600 bph, ensuring accuracy within daily use.

Historical Context

Over 25 million units from the 2770 family were made, reflecting ETA’s dominance before the quartz crisis. The 2773 powered models like the Rado Conway, valued today by collectors for serviceable parts availability. Production ceased around 1982, but spares remain accessible for repairs.

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The ETA 2776 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, produced in large quantities between 1969 and 1982, with over 25 million units made. Closely related to the ETA 2770, it features a sweep second hand and optional hacking mechanism, making it a workhorse for mid-range vintage timepieces. This caliber belongs to ETA’s 2700 series, early predecessors to the iconic 2824-2 framework that defined modern automatics.​
Key Specifications

Type: Self-winding automatic with sweep seconds.

Production Era: 1969–1982, high-volume output for affordability.​

Dimensions: Approximately 11.5 ligne (25.6mm diameter), slim profile for dress watches.​

Jewels: 17–25, depending on variant, reducing friction for longevity.​

Frequency: 21,600 vph (3 Hz), balancing power and smoothness.

Power Reserve: Around 40–45 hours when fully wound.

Design and Features

The ETA 2770/2776 shares a bidirectional rotor for efficient winding and robust construction suited to daily wear. Its optional hack stops the seconds hand for precise time-setting, a feature prized in vintage repairs. Incabloc shock protection enhances durability against impacts. Variants supported date windows, appealing to brands like Omega and Tissot in entry-level models.​
Historical Significance

Produced during ETA’s expansion under Swatch Group precursors, the 2776 powered countless Swiss watches, bridging post-quartz crisis recovery. Today, it’s collectible for restorers due to abundant spare parts availability. Accuracy typically holds -10/+30 seconds per day unregulated, often tunable to chronometer levels.​
Maintenance Tips

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The ETA 2779 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, part of the popular 2770 family produced between 1969 and 1982. Known for its robustness and widespread use in mid-range timepieces, it features day-date complications and a Triovis regulator for precise adjustments. Over 25 million units of this family were made, cementing ETA’s reputation in horology.
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Key Specifications

Diameter: 11.5 lignes (25.6 mm), fitting standard case sizes.

Height: 6.0 mm, accommodating day-date wheels.

Jewels: 25 synthetic rubies for reduced friction.

Beat rate: 21,600 vibrations per hour (A/h), offering 48-hour power reserve.

Functions: Sweep seconds, date, day display via dial aperture; quick date-setting and Triovis fine regulator.

Design and Features

This self-winding caliber pairs with the manual-wind ETA 2759 base. It uses an anchor escapement with direct sweep seconds and bidirectional rotor for efficient winding. The Triovis regulator enhances accuracy against temperature changes, while complications support +/-24-hour adjustments.
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Historical Context

Introduced in the late 1960s amid the quartz crisis, the 2779 powered brands like Omega, Tissot, and Longines. Production ended in 1982 as ETA shifted focus, but its parts remain available for servicing vintage watches.

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The ETA 2781 is a reliable automatic watch movement from the ETA 2770 family, produced between 1969 and 1982. Known for its quickset date function, it powered numerous vintage timepieces during its era. This article explores its key features and legacy in horology.
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Technical Specifications

Diameter: 11.5 lignes (25.6 mm), fitting standard case sizes.

Height: 5.9 mm, allowing slim profiles in dress watches.

Jewels: 17, 21, or 25, reducing friction for longevity.

Frequency: 21,600 vibrations per hour (vph), balancing accuracy and durability.

Power Reserve: Approximately 47-48 hours when fully wound.

Lift Angle: 52 degrees, optimizing balance wheel performance.

Design and Functions

The ETA 2781 features bidirectional automatic winding via a rotor, paired with a manual hand-winding option through its corresponding ETA 2761 base. Its standout quickset date mechanism simplifies adjustments, a boon for daily wearers. Shock protection (Incabloc or similar) safeguards the balance during impacts, while the Triovis regulator option in variants enhances precision.

​Historical Context

Part of ETA’s prolific 2770 series—over 25 million units made—this movement emphasized affordability and serviceability amid the quartz crisis. It appeared in brands like Omega and Tissot, often in mid-range automatics. Production ended in 1982, but NOS examples remain available for restorers.

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The ETA 2782 is a vintage Swiss automatic watch movement produced by ETA SA, renowned for its reliability in mid-20th-century timepieces.
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Key Specifications

Introduced in the 1960s or early 1970s, the ETA 2782 features a central rotor for self-winding, a sweep seconds hand, and quickset date at 3 o’clock. It typically includes 25 jewels, Incabloc shock protection, and optional hacking (seconds hand stops when crowning for setting). Beat rate stands at 21,600 vph (3 Hz), with a power reserve around 38-42 hours.

Dimensions: 11.5 lignes (25.6mm diameter), 4.6mm thick.

Functions: Hours, minutes, central sweeping seconds, date.

Winding: Bi-directional automatic rotor; hand-windable.

Lift angle: Approximately 52 degrees.

Design and Variants

This movement belongs to ETA’s 2700 series, emphasizing economy and robustness for everyday watches. Variants like the 2783 may add day-date, but the base 2782 prioritizes simplicity. It shares architectural traits with the 2800 family (e.g., 2824), including dial feet positions for easy swapping.
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Usage in Watches

Found in brands like Titoni Airmaster, OLMA, and Alpina, often in gold cases from the 1960s. Collectors value it for serviceability during full restorations, with parts like calendar wheels and motion works commonly addressed.
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