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]. Arguably, this is the most important automatic movement of all time.

50m - 100m made between 1970 to today.

So many brands have used this cailber ... really anything Swiss from the 70's to the 90's ... Tudor, Longines, etc.

It's the grandfather of this line of ETA movements.

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]
160 components in the movement.
Very easy to get spare parts.
$300 AUD to buy a full movement
Easy to service

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

............

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]

.............

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]

............

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

---

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.

................

..............