The ETA 2895-2 is a reliable Swiss automatic watch movement renowned for its slim profile and precision, introduced in 1999 as part of ETA’s 2890 family.

​Key Specifications

Diameter: 25.6 mm (11½ lignes), with a movement height of 4.35 mm and total height of 5.80 mm.

​Jewels: 27, including additions from its small seconds module.

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

​Power Reserve: Approximately 42 hours, powered by bi-directional automatic winding with a ball-bearing rotor.

​Features and Functions

This modular movement builds on the ETA 2892-A2 base, adding small seconds at 6 o’clock and a date window at 3 o’clock with quickset correction. It includes hacking seconds for precise time-setting and supports grades like Elabore, Top, and Chronometer for varying accuracy levels. The ETACHRON regulator and stone lever escapement enhance stability.

​History and Usage

Launched to replace the ETA 2895-1, it remained in production through 2021 for non-Swatch Group brands, with proprietary versions continuing. Brands like TAG Heuer (as Calibre 6) have used it in high-end models for its robustness and serviceability. Dimensions suit mid-size dress watches, with hand sizes of 150/90/25 for hour/minute/small seconds.

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The ETA 2896 is a Swiss automatic watch movement renowned for its big date complication, derived from the reliable ETA 2892-A2 base.
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Key Specifications

Introduced around 2003-2004, this third-generation ETA 2890 family caliber measures 25.6mm in diameter (11.5 lignes) and 4.85mm thick, with 22 jewels and a 28,800 vph beat rate. It offers 42 hours of power reserve via a bi-directional ball-bearing rotor, Incabloc shock protection, ETACHRON regulator, and hacking seconds for precise setting. The lift angle stands at 51 degrees, supporting hand-wind capability and three central hands.

Notable Features

Big Date Display: Uses dual concentric overlapping wheels at 3:00 for a clear double-digit view, quickset adjustable.

Modular Design: Slim profile allows easy addition to base movements, ideal for luxury complications.

Reliability: Swiss-made with robust construction, powering numerous high-end watches until ETA restricted sales post-2021 to Swatch Group.

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The ETA 2897 is a reliable automatic watch movement from ETA SA Manufacture Horlogère Suisse, renowned for powering mid-to-high-end Swiss timepieces. Derived from the popular ETA 2892-A2 base, it incorporates a modular design with added complications for enhanced functionality. Introduced around 2004, it remained in production until about 2021 for non-Swatch Group brands.
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Key Specifications

Diameter: 25.6 mm (11.5 lignes), fitting standard 40-42 mm cases.

Height: 4.85 mm, slim profile ideal for dress watches.

Jewels: 21, reducing friction for longevity.

Frequency: 28,800 vph (4 Hz), balancing smoothness and power efficiency.

Power Reserve: Approximately 42-50 hours when fully wound.
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Features and Complications

This self-winding caliber features bi-directional winding via a central rotor, hours/minutes/seconds hands, a date window, and a power reserve indicator—often at 6 o’clock for quick glances. It supports hacking (seconds stop when crown pulled) and manual winding, with grades from Elabore to Chronometer for varying accuracy (±12 to COSC standards). Its modular setup allows easy addition of modules without altering the core.

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The ETA 7001 is a timeless mechanical hand-wound movement renowned for its slim profile and reliability in vintage-inspired watches.

​Overview

Introduced in 1971 by ETA/Peseux, the 7001 measures 10½ lignes (23.3mm diameter) and just 2.5mm thick, making it ideal for slim cases. This lever escapement caliber beats at 21,600 vph (3Hz) with 17 jewels and offers a 42-45 hour power reserve. It features central hour and minute hands, a small seconds at 6 o’clock, and Incabloc shock protection.
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Key Specifications

Dimensions: 23.3mm diameter, 2.5mm height (H2 type)

Jewels: 17, reducing friction in critical pivots

Frequency: 21,600 bph for smooth seconds sweep

Power Reserve: Approximately 42-45 hours when fully wound

Accuracy: Middle rate of +/-7 seconds/day; index or Etachron regulator

Hands: 1.30/0.80/0.17mm (hour/minute/small seconds)

Finish: Brass plates/bridges, nickel plating, beveled edges
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Historical Significance

Produced until recent years, the 7001 powered watches from Tissot, Longines, Omega, Nomos (1992-2005), Baume & Mercier, and modern brands like Baltic and Furlan Marri. It’s a direct replacement for Peseux 7001 and base for variants like Omega 651 or Ball automatics. Brands like Ming have heavily modified it for custom aesthetics.

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The ETA 9154, also known as the Ebauches SA or ESA 9154, represents an early bridge between mechanical and electronic watchmaking. Introduced around 1970, this vintage “Dynotron” movement marked a transitional phase in horology with its electronically controlled balance motor. Produced into the mid-1970s, it powered various watches during the quartz revolution’s dawn.
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Key Features

Electronic Regulation: Uses a transistor-based circuit to control the balance wheel, enabling a smooth sweep seconds hand unlike abrupt quartz stepping.

Calendar Functions: Includes quickset date, with some variants offering day-date complications via dedicated wheels and jumpers.

Hack Mechanism: Features mechanical and electrical stopping for precise time-setting, plus a sweep second pinion.

Battery-Powered: Relies on a standard cell (e.g., reference 343) with a fixing clamp, driving the motor electronically.

Technical Specs

Size and Build: Compact design with auxiliary plates, balance bridge, and interchangeable parts like those in related ETA/ESA 9157/9158 calibers.
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Components: Key elements include cannon pinion (SS, ref 245/1193), minute wheel (260/1109), and regulator (2-piece, 301/1399).

​Maintenance Notes: Prone to circuit issues like resistance in ESC contacts; repair involves cleaning solder residue.
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Historical Context

Ebauches SA, later absorbed into ETA, produced the 9154 amid 1970s innovation. Collectors value its quirky hybrid nature—mechanical gears with electronic pulses—for vintage restorations. Spare parts remain available for wheels, screws, and modules, supporting ongoing repairs.

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The ETA 9157 is an electronic tuning fork watch movement developed by ETA (under Ebauches SA, or ESA) in the late 1960s, marking a transitional technology between mechanical and quartz eras. Introduced around 1968 and produced into the 1970s, it powered affordable electronic watches with reliable timekeeping via an electronically controlled balance.
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Key Features

Tuning Fork Mechanism: Operates at 28,800 A/h (vibrations per hour) with a sweep seconds hand for smooth motion, using a balance motor rather than a traditional escapement.

Dimensions and Jewels: Measures 13 lignes (29mm diameter) in third-generation versions, featuring seven jewels for reduced friction.

Functions: Includes day/date display with quickset date (via 18-24 hour adjustment) and mechanical hacking seconds for precise synchronization.

Power Source: Battery-powered with electronic components like resistors, transistors, and a modern battery placement in later models.
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Historical Context

Part of the ESA Dynotron family (evolving from Cal. 9150 in 1967), the 9157 represented a redesign by 1975, relocating the balance 90 degrees and minimizing electronics for efficiency. It succeeded electric movements like Landeron 4750 but preceded dominant quartz calibers. Production ended by the late 1970s amid quartz dominance.

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The ETA 9158, originally an ESA Dynotron movement later produced by ETA, represents a transitional electronic caliber from the 1970s. Introduced around 1975, it features an electronically controlled balance motor with a sweep second hand for smooth operation. This third-generation Dynotron measures 13 lignes (29mm diameter) and offers reliable accuracy at 28,800 A/h beat rate.
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Key Specifications

Type: Electronic tuning fork/balance wheel hybrid, battery-powered quartz alternative.

Size: 29mm diameter, 6.2mm height, 7 jewels.

Functions: Hours, minutes, sweep seconds, day-date at 3 o’clock (often gold or blue disks).

Features: Electrical hacking for precise setting, shock-resistant elements.

Historical Context

Developed by Ebauches SA (ESA), the Dynotron family began with Cal. 9150 in 1967, evolving through 9154 to the 9158 by 1975. ETA continued production post-ESA merger, using it in watches like Jaz Divers and Hamilton models. It bridged mechanical and full quartz eras with minimal jewels for cost efficiency.

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Technical Highlights

The movement employs a prominent balance wheel and compact electronics, including resistors and transistors. Troubleshooting involves checking current consumption and train friction, as noted in 1970s service bulletins. Spare parts remain available for vintage repairs, including wheels and pinions.

Modern Relevance

Today, ETA 9158 appeals to horology enthusiasts restoring 1970s divers or dress watches. Its hi-beat electronic design offers accuracy without stepping motors, preserving sweep motion. Collectors value it for rarity in brands like Jaz.

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The ETA 9162 represents an innovative bridge between mechanical and electronic horology from the late 1960s. Introduced in 1969 by ETA (now part of Swatch Group), this movement features an electronically controlled balance motor, marking an early hybrid design in watchmaking. It powered select timepieces during a transitional era when quartz technology loomed large.
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Key Specifications

Introduction Year: 1969, coinciding with the quartz revolution’s onset.

Core Technology: Electronically regulated balance wheel with motor control for precise timekeeping.

Functions: Hours, minutes, sweep seconds, and hacking seconds (stops hand for precise setting).
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Size and Design: Compact for dress watches, with a focus on reliability in an era of mechanical dominance.

Historical Significance

The ETA 9162 emerged as watchmakers grappled with emerging electronic rivals. Produced by ETA, a powerhouse in Swiss movements, it utilized a sweep second hand for smooth motion akin to mechanical calibers. Though short-lived due to full quartz adoption, it exemplifies transitional engineering, appearing in various 1970s models.
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Technical Highlights

Balance Motor: Electronic control enhanced accuracy over pure mechanical oscillators.

Hack Feature: Allows second hand to halt during time-setting, a user-friendly innovation.

Usage Period: Primarily 1969 onward, before quartz fully supplanted hybrids.

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The ETA 9164 is a vintage electronic tuning fork watch movement produced in the early 1970s. Known for its innovative electronically controlled system, it offered reliable timekeeping during the quartz transition era.
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Key Features

Sweep second hand with smooth motion from the tuning fork mechanism.

Day and date complications, quickset via crown pulls.

Hack mechanism stops the balance for precise setting.

Technical Specs

Produced from 1972 to 1974 by ETA (and related to ESA 9164 base).

Battery-powered with accessible regulator in the compartment.

Shock protection and reliable restart on crown push.

Historical Context

Used in various Swiss watches, including Omega’s caliber 1260 variant. It bridged mechanical traditions and electronic precision amid the 1970s quartz crisis. Parts like intermediate wheels (203), third wheels (210), and cannon pinions (240) remain available for repairs.

​Service Notes

Stem release via sliding mechanism; common spares include sweep second wheel (227) and hour wheel (250). Ideal for vintage enthusiasts restoring 1970s pieces.

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The ETA 9180, often listed under ETA/ESA nomenclature, represents an early quartz innovation from the 1970s quartz crisis era. Developed by ETA (part of the Swatch Group lineage) and closely tied to Eterna’s ESA branding, this movement bridged mechanical traditions with electronic precision in Swiss watchmaking.
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Key Specifications

Type: Quartz-controlled stepper motor with sweep seconds hand.

Size: 29.00 mm diameter; approximately 5.55 mm thick (comparable to siblings like ETA 9164).
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Jewels: 7 jewels, primarily on visible movement side for seconds and third wheels.

Battery: Cell 343 (SR1130 equivalent).

Functions: Hours, minutes, sweep seconds, date with quickset (bidirectional).

Innovative Features

This caliber stood out with dual hacking: electrical via a lever at 8:30 and mechanical via a rotor-blocking lever. Its oversized, heavy rotor featured eight tiny permanent magnets and shock-protected bearings, driving a complex four-coil system—far more elaborate than modern single-coil Lavet motors. Dial-side innovations included a plastic date ring (prone to brittleness after decades) and yoke keyless works for setting.

​Historical Context

Introduced around 1973, the 9180 powered vintage pieces like Eterna Quartz Electronic watches, marking ESA’s final complex quartz design before simpler successors like the 9360. It highlighted rapid evolution, rendering mechanicals nearly obsolete overnight, yet offered reliability in 29mm cases from brands like Longines and Certina analogs. Parts remain available for restoration, including wheels (e.g., third wheel, cannon pinion).

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