ETA 2824-2 / PT5000 / ST2130 / Sellita SW200-1

 The ETA Caliber 2824-2 Watch Movement is a legendary, Swiss-made automatic mechanical movement introduced in 1982 as an evolution of the earlier ETA 2824 and 2824-1 lines. Widely known as a reliable "workhorse" of the watch industry, it is featured in countless mid-range to high-end timepieces. [1, 2, 3]

Key Specifications

Type: Self-winding automatic mechanical movement with bi-directional ball-bearing rotor [1, 2]
Diameter: 25.60 mm (11½ lignes) [1]
Height / Thickness: 4.60 mm [1]
Jewels: 25 jewels [1]
Frequency: 28,800 vibrations per hour (4 Hz) [1]
Power Reserve: Approximately 38 to 42 hours [1, 2]
Functions: Central hours, minutes, and sweep seconds; date complication at 3 o'clock with quick-set feature [1, 2]
Shock System: Incabloc shock protection [1, 2]

Grades Available

The movement was produced in four primary factory grades: [1, 2]

Standard: Regulated in two positions; average accuracy of roughly ±12 seconds per day (though often regulated closer).
Elaboré (Elaborated): Regulated in three positions; average accuracy of ±7 seconds per day (max daily variation up to ±20s).
Top: Regulated in five positions; average accuracy of ±4 seconds per day (max daily variation up to ±15s).
Chronometer: Meets official COSC certification standards (limited daily variation of -4/+6 seconds per day). [1, 2, 3]

Common Clones & Alternatives

Because its design patents expired in the early 2000s, several direct equivalents and clones entered the global market: [1, 2, 3]

Sellita SW200-1 (nearly identical Swiss alternative with 26 jewels)
Seagull ST2130 (Chinese clone)
PT5000 (popular high-beat clone
peacock sl3001

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The PT5000 is an affordable, mechanical automatic-winding watch movement made in China by HK Precision Technology as a near one-to-one clone of the Swiss ETA 2824-2. [1]

Key Specifications

Frequency: 28,800 vph (4 Hz) for a smooth-sweeping seconds hand [1]
Jewels: 25 jewels [1]
Power Reserve: Approximately 38 hours [1]
Dimensions: 25.60 mm diameter and 4.60 mm thickness [1]
Functions: Hacking (seconds stop when setting time), manual and automatic winding, and a quickset date at 3 o'clock [1]
Cost: Around $30–$50 USD per movement

Performance and Reliability

Accuracy: Officially rated at -10/+30 seconds per day, though many owners and microbrands report real-world performance closer to ±2 to ±5 seconds per day. [1, 2]
Hand-Winding Caution: According to community reports on Reddit, manual winding can feel a bit gritty or "sandy," and users generally advise winding it sparingly to avoid stress on the keyless works. [1]
Parts Compatibility: Because it mirrors the ETA 2824-2 architecture, it shares common dimensions, hand sizes, and case compatibility with the Swiss caliber. [1, 2]

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Popular Brands and Watches Using the ETA 2824-2

Stowa: Famous for its clean Bauhaus and pilot watches, including the Stowa Flieger Classic, Marine 36/40, Partitio, and Antea Klassik. [1]
Hamilton: Historically featured in models like the Hamilton Khaki Field Auto and early automatic field watches. [1]
Tudor: Used in early iterations of the Tudor Heritage Black Bay and as the base for the T601 caliber. [1]
Breitling: Utilized as the foundation for the COSC-certified Breitling Caliber 17 (B17) found in various Superocean dive watches. [1, 2]
TAG Heuer: Used as the base for the TAG Heuer Calibre 5 in time-and-date variations of the Aquaracer and Carrera. [1]
Oris: Historically employed the 2824-2 as the base for its signature "red-rotor" automatic sports and dive watches. [1]
Sinn: Used in core tool watches like the Sinn 556. [1]
Tissot: Featured in select chronometer releases such as the Tissot Heritage 1938 Automatic COSC. [1, 2]
Christopher Ward: Historically used in models like the C60 Trident Pro before shifting to alternative movements. [1]
Doxa / Certina / Longines / Victorinox: Various vintage and past tool, dress, and dive watches across the broader Swatch Group and independent Swiss landscape. [1, 2, 3]

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Comparison of Watch Movements

Feature / Spec	DG2813 (Mingzhu)	Miyota 8215	Seiko NH35 (TMI)	PT5000
Origin	China (Dixmont Guangzhou)	Japan (Citizen)	Japan / Seiko Sub-brand (TMI)	China
Beat Rate (VPH)	21,600 vph (3 Hz / 6 ticks per sec)	21,600 vph (3 Hz / 6 ticks per sec)	21,600 vph (3 Hz / 6 ticks per sec)	28,800 vph (4 Hz / 8 ticks per sec)
Jewels	21–22 jewels	21 jewels	24 jewels	25 jewels
Power Reserve	~36–40 hours	~42 hours	~41+ hours	~38–42 hours
Hacking (Seconds Stop)	Yes (usually)	Version-dependent / older ones no, newer ones yes	Yes	Yes
Winding Direction	Unidirectional	Unidirectional (free-spinning rotor)	Bidirectional ("Magic Lever")	Bidirectional
Factory Accuracy	±60 sec/day (inconsistent)	-20 to +40 sec/day	-20 to +40 sec/day (often better in practice)	High-beat / tighter potential (often ±5s/day)
Base Inspiration	Miyota 8200/8215 layout	Original Miyota design	Seiko 4R35 architecture	ETA 2824-2 clone
Approx. Price	$10–$20 USD	$25–$35 USD	$35–$55 USD	$30–$50 USD

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Detailed Breakdown

1. DG2813 (Mingzhu)

Overview: An ultra-budget Chinese automatic movement designed loosely around the Miyota 8-series architecture. [1, 2]
Pros: Extremely cheap ($10–$20 USD), widely found in low-cost or replica watches, features hacking seconds on most modern iterations. [1, 2, 3, 4]
Cons: Poor quality control, rough finishing, higher failure and date-mechanism breakdown rates, and loose/inconsistent timekeeping. Often seen as a disposable movement. [1, 2]

2. Miyota 8215

Overview: A classic, rugged Japanese workhorse from Citizen's Miyota division. [1, 2]
Pros: Legendary mechanical longevity, cheap and easy to service or replace, reliable daily beater.
Cons: Uses a unidirectional winding rotor that can spin freely and make a whirring/zipping noise, and is notorious for the "indirect seconds stutter" (where the second hand can momentarily hesitate if tapped or jarred). Hacking was historically absent on older variants. [1, 2, 3, 4]
Check specs, accuracy, and comparisons in Miyota 8215 vs NH35 on Watch and Bullion. [1]

3. Seiko NH35 (TMI 4R35)

Overview: Produced by Seiko's Time Module Inc. (TMI), this is the undisputed king of the modern affordable microbrand and modding community.
Pros: Bidirectional "Magic Lever" winding system (quieter and more efficient winding feel), hacking and hand-winding standard, massive modding ecosystem for dials, hands, and cases, and dependable workhorse reliability.
Cons: Thicker hand stack can make setting time feel a bit high-profile, base factory accuracy spec is conservative (-20/+40) though individual units often run much better.
Read community discussions regarding everyday reliability on Reddit r/ChineseWatches. [1, 2, 3, 4]

4. PT5000

Overview: A Chinese-manufactured automatic movement engineered as a clone of the Swiss ETA 2824-2. [1]
Pros: High-beat movement running at 28,800 vph (8 ticks per second) instead of 21,600 vph, resulting in a much smoother sweeping second hand. Generally offers superior accuracy potential out of the box or when regulated. [1, 2, 3]
Cons: Higher batch-to-batch quality variance than Japanese movements, thinner power reserve margin (~38–42 hours), and harder/more expensive to service if something goes wrong compared to dropping in a cheap Seiko or Miyota


Which should you choose?
Choose the NH35 if you want the best all-around daily-wear reliability, quiet operation, and easy modding/parts support.
Choose the PT5000 if you want a smooth, high-beat Swiss-style sweep and better accuracy potential on a tight budget.
Choose the Miyota 8215 if you prefer a slim, time-tested Japanese alternative, provided you don't mind the free-spinning rotor noise or second-hand stutter.
Avoid the DG2813 unless you are experimenting on a $15 throwaway movement or learning watch disassembly.

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