The ETA 2502 is a vintage manual-wind mechanical watch movement produced by ETA SA, a cornerstone of Swiss horology known for reliable ebauches used across brands.

​Key Specifications

Size and Beat Rate: 11.5 lignes diameter, 18,000 vibrations per hour (vph) for smooth sweeping seconds.

Power Reserve: Approximately 40-46 hours, typical for ETA 2500-series movements.

Jewels: 17 jewels, reducing friction in critical pivots for longevity.

Functions: Time-only with date complication at 3 o’clock; no quickset date—advance manually between 8-12 o’clock positions.

Design and Features

Crafted in the mid-20th century, the ETA 2502 belongs to the 2500 family, emphasizing simplicity and robustness for dress watches and mid-range chronometers. Its manual winding via a crown ensures direct barrel engagement, delivering consistent torque. The date mechanism uses a simple jumper system, reliable but requiring careful setting to avoid slippage.
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Historical Context

Introduced around the 1960s, it powered affordable luxury timepieces from brands like Omega and Longines before automation dominated. NOS (new old stock) units remain available for restorations, often missing minor parts like hour wheels. Collectors value its no-frills construction amid ETA’s shift to higher-beat calibers.

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The ETA 2510 is a classic manual-wind mechanical watch movement produced by ETA SA from 1959 to 1975, renowned for its reliability in vintage timepieces.

​Key Specifications

Size and Build: 7.75 lignes (17.20 mm diameter, 2.85 mm height) with 17 jewels for reduced friction.

Beat Rate: 18,000 beats per hour (A/h), delivering smooth seconds hand sweep typical of high-quality 1950s-1970s calibers.

Power Reserve: Approximately 40-45 hours, suitable for daily winding without excessive frequency.

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ETA 2512 is a compact, hand‑wound Swiss movement valued for its robustness, slim profile and long production span from the late 1950s into the 1970s. It was widely used in smaller dress watches, especially ladies’ pieces, and remains attractive today for restoration projects and vintage builds.
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Technical overview

Manual‑wind movement with 17 jewels and Swiss lever escapement.

Frequency of 21,600 vibrations per hour, balancing durability and accuracy for everyday wear.

Diameter around 7¾ lignes (about 17.2 mm) with a slim height near 2.8–3.0 mm, ideal for small, elegant cases.

Power reserve typically quoted around 40–44 hours when fully wound.

Design features

Indirectly driven minute hand via the third wheel, freeing space for a larger balance and mainspring barrel; this supports better rate stability and longer running time.

Incabloc shock protection and a conventional index regulator, making regulation and basic service straightforward for most watchmakers.

Round movement layout with simple three‑hand time display and no date, keeping the construction clean and service-friendly.
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Collecting and servicing

Commonly found in mid‑century Swiss brands and private‑label watches, often under alternative caliber designations from houses like Dugena or BM.

Spare parts can still be sourced through movement dealers and donor watches, although certain key components (like balances and staffs) are becoming scarcer as stocks age.

When properly serviced and adjusted, ETA 2512 can deliver performance comparable to many modern entry‑level mechanical calibers, making it a solid choice for vintage restorations.

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The ETA 2512-1 is a compact manual-wind mechanical movement from ETA, ideal for ladies’ watches during the quartz era transition.
Overview

Developed in the late 1970s, the ETA 2512-1 exemplifies efficient Swiss engineering for smaller cases. Produced roughly from 1976 to 1983, it prioritizes reliability with a bare finish and modern construction borrowed from movements like the ETA 2410. Its 7 3/4”’ diameter (about 17.2mm) and 2.85mm height suit slim designs without a seconds hand.
Key Specifications

Jewels: 17, reducing friction in critical pivots.

Beat rate: 21,600 A/h (6 beats per second) for smooth operation.

Lift angle: 52 degrees, optimizing energy transfer.

Power reserve: Approximately 44 hours, aided by a large mainspring barrel.

Balance: Three-leg nickel annular type with Incabloc shock protection and moveable stud.

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The ETA 2520 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, part of the 2500 family introduced in the 1950s. Known for its vintage appeal and robustness, it powers classic timepieces with smooth time-only functionality. This article explores its key features and legacy in approximately 300 words.
Technical Specifications

Size and Beat Rate: Measures 11.5 lignes (25.6mm diameter), beating at 18,000 vibrations per hour (vph) for a deliberate sweep seconds hand.

Power Reserve: Approximately 40-42 hours when fully wound, suitable for daily wear without constant resetting.

Jewels: Typically 17 jewels, reducing friction in critical pivots for longevity.

Shock Protection: Equipped with KIF shock protection system, enhancing durability against impacts.
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Design and Functionality

The ETA 2520 features a self-winding rotor with bidirectional winding, derived from earlier ETA designs like the 2000 series. It omits date complications, focusing on clean timekeeping with central hours, minutes, and sweep seconds. Produced primarily in the 1960s-1970s, it often appears rhodium-plated in luxury variants, such as Omega’s adapted Caliber 2520. Its 13.8mm height fits slim dress watches comfortably.

Historical Significance

As part of ETA’s workhorse 25XX lineup, the 2520 exemplifies quartz crisis-era engineering, prioritizing affordability and serviceability. Brands like Corum and others used it in vintage models, making parts still available today via specialists. Collectors value its “new old stock” examples for restoration projects.

​Modern Relevance

Though discontinued, the ETA 2520 remains popular among horology enthusiasts for repairs and custom builds. Its lower beat rate offers a traditional feel compared to modern 28,800 vph movements, ideal for vintage-inspired watches. Spare parts scarcity underscores the need for skilled watchmakers.

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The ETA 2521 is a vintage automatic mechanical watch movement produced by ETA SA, renowned for its reliability during the late 1960s and early 1970s.
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Overview

Introduced around 1965-1970, the ETA 2521 served as an adaptation of Otero family calibers to meet surging demand for affordable automatics, often rebranded under Dugena names. This 13 ligne (29mm diameter) movement features a sweep seconds hand and date complication, with an excenter winding system for smooth self-winding. It powered various mid-range watches, emphasizing ETA’s role in democratizing mechanical horology.
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Key Specifications

Dimensions: 29.00mm diameter, 4.50mm height.

Jewels: 17/25 configuration.

Frequency: 18,000 A/h (2.5 Hz).

Power Reserve: Approximately 42 hours.

Functions: Automatic winding, central seconds, date window (set via crown at 20:30-24:00).

​Historical Context

The 2521 emerged amid the quartz crisis prelude, bridging manual and automatic eras with robust construction. It shares traits with ETA’s 2500 family, using Incabloc shock protection for durability. Collectors prize it for serviceability, with parts still available from specialists.

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The ETA 2522 is a vintage automatic mechanical watch movement produced by ETA SA, renowned for its reliability in mid-20th-century timepieces.
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Key Specifications

Size and Build: 11.5 lignes (25.6mm diameter), 4.5mm height; features a central rotor for self-winding and sweep seconds hand.

Functions: Automatic winding, date window (set via 2 o’clock pusher), Swiss lever escapement, and balance wheel control.

Performance: Approximately 40-hour power reserve; 17 jewels standard, with shock protection options like Incabloc.

Historical Context

Introduced around the 1950s, the ETA 2522 evolved from earlier models like the 1476N or 1396N, serving as a workhorse in Swiss watches. It powered various brands during ETA’s expansion, emphasizing durability for everyday use before modern calibers like the 2824 dominated. Collectors value it today for restoration projects due to available spare parts.

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The ETA 2540 is a compact manual-wind movement from the Swiss manufacturer ETA, renowned for its reliability in vintage ladies’ watches. Produced from 1965 to 1972, it served as the base model for the 2540 series, emphasizing precision in slim cases.

​Key Specifications

Size: 7¾ lignes (approximately 17.2 mm diameter), ideal for women’s timepieces.

Jewels: 17, reducing friction in critical components.

Beat Rate: 21,600 vibrations per hour (vph), with a 44-hour power reserve.

Features: Sweep seconds hand driven directly from the center, Incabloc shock protection, and movable balance stud for fine regulation.

Design and Functionality

Engineers designed the ETA 2540 with a Swiss lever escapement and stem-winding/setting mechanism, ensuring smooth operation in small formats. Its direct-driven center seconds provide fluid motion without a sub-second complication, enhancing readability in dress watches. The movement’s simplicity made it a staple for brands like Golana, with new old stock (NOS) units still available today.
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Historical Context

ETA introduced the 2540 amid the rise of compact mechanical calibers, predating quartz dominance. It powered elegant vintage pieces, prized by collectors for serviceability and parts availability. Though discontinued, its legacy endures in horology, with variants like automatic upgrades in later series.

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The ETA 2541 is a reliable manual-wind mechanical watch movement from the renowned Swiss manufacturer ETA SA, produced primarily in the mid-20th century.
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Key Specifications

Size and Jewels: 7 3/4 lignes diameter with 21 jewels for reduced friction and longevity.

Beat Rate: 21,600 beats per hour (BPH), enabling smooth sweep seconds hand motion.

Functions: Central sweep seconds and date window at 3 o’clock; date quick-set by advancing time past 21:20-24:00.

Shock Protection: Incabloc system safeguards the balance from impacts.

Hand Sizes: Hour 70/120, minute 120, seconds 22 for standard compatibility.

Design and Performance

This compact caliber suits dress watches and vintage models, offering a power reserve of about 42-46 hours when fully wound. Its nickel-plated finish enhances durability, while the elaborate construction supports precise regulation. Common in mid-range Swiss timepieces, it emphasizes ETA’s tradition of robust, serviceable movements.

Common Repairs and Parts

Endshake Issues: Fourth wheel excess play can contact the third wheel, halting operation; requires careful adjustment.

Available Spares: Ratchet wheel (part 425), date indicator maintaining plate (small version), and click components remain accessible for restorers.

​Servicing Tips: Use tools like Horotec for balance and stud work; compatible with ETA 2540 family parts.

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The ETA 2550 is a vintage automatic mechanical watch movement produced by ETA, a renowned Swiss manufacturer, primarily during the 1960s and early 1970s. Known for its reliability in mid-range timepieces, it features a sweep second hand and robust construction suitable for everyday wear. This caliber exemplifies ETA’s early automatic innovations, blending functionality with durability.
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Key Specifications

Type: Automatic self-winding with ball-bearing rotor for smooth winding.

Functions: Hours, minutes, sweep seconds; some variants include day-date complications adjustable via crown.

Jewels: Typically 25, reducing friction in critical pivots.

Frequency: 18,000 vibrations per hour (2.5 Hz), offering a balance of accuracy and longevity.

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

Historical Context

Introduced around 1955-1965, the ETA 2550 powered various dress and sports watches from brands like Omega, Tissot, and Longines until about 1972. Its shock protection system, often Incabloc, enhanced resistance to daily impacts. Production ceased as ETA shifted to higher-beat calibers like the 2824, but spares remain available for restoration.
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Technical Highlights

Dimensions: 11.75 lignes (26mm diameter), height around 4.6mm, fitting standard cases.

Rotor: Bidirectional winding via peripheral ball-bearing for efficiency.

Date Mechanism: Quick-set via +/-24-hour adjustment; reliable but manual.
The movement’s simplicity aids repairs, with parts like pallet forks and balance staffs widely cataloged.

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