Sea-Gull

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Sea-Gull ST16 – Miyota-style simplified construction with Seiko-style auto-winding. Many calendar and 24-hour display options available.

Sea-Gull ST17 – Upgraded ST16 with even more options including jump-hour, big date and power-reserve. Skeleton versions, both automatic and hand-winding.

Sea-Gull ST18 (Sea-Gull ST1812) – Premium ETA 2892-style movement; fast-beat, automatic, day/date.

Sea-Gull ST19 – Hand-winding chronograph developed from Venus 175. Available as skeleton or with power-reserve.

Sea-Gull ST21 (Sea-Gull ST2130) – Clone of ETA 2824-2 (Often incorrectly referred to as ST24)

Sea-Gull ST22 – A pair of small ST6 automatics on a common dial plate. Open-heart and big-date options.

Sea-Gull ST25 – Premium movement with double-bridged balance for open-heart. Various calendar options.

Sea-Gull ST28 – AS1475-style hand-winding alarm.

Sea-Gull ST31 – Unusual bowtie-shaped movement with linear train, open-heart, subsidiary seconds and day/night indicator. Also available as skeleton.

Sea-Gull ST36 (Sea-Gull ST3600) – Unitas 6497-style 36mm pocket watch movement, hand-winding with subsidiary seconds. Skeletonized version with unusual bar-type bridges.

Sea-Gull ST41 – Thin, small hand-winding movement, hour and minute display only.

Sea-Gull ST80 – Blancpain-style flying caroussel-Tourbillon. Various calendar and power-reserve options. Hand-winding or automatic. Skeleton version is hand-wind only, no options.

Sea-Gull ST82 – Tourbillon with large-diameter balance on common axis with carriage. Hand-winding or automatic. 'Flying' or bridged Tourbillon.

Sea-Gull ST8080 – Hand-winding dual tourbillon; caroussel and common axis.

Sea-Gull ST84 – Hand-winding common axis tourbillon. Narrow movement suitable for women's watches.

Sea-Gull ST90 – Hand-winding quarter-repeater.

Sea-Gull ST91 – Hand-winding minute repeater. ST9150 includes perpetual calendar (as per ST2590).

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Seagull ST2130 Automatic Movement Technical Drawing – Clone of ETA 2824-2

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ETA 2824-2 AND SELLITA SW200-1 CLONE MOVEMENT SEA-GULL ST2130

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It is a myth that 'Asian ETA/Valjoux/Unitas' movements are made by Chinese companies using ETA tooling. A careful examination of ETA movements alongside their Chinese equivalents reveals some subtle differences. The Chinese designs appear to be adapted to simplify manufacturing and assembly and to enhance durability. There are other differences that are simply...different. Sea-Gull, Hangzhou, Liaoning, and Shanghai watch factories have all had to create their own tooling to produce these movements.
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ETA 2824-2 - ETA's basic automatic winding, twenty-five (25) jewel movement which traces its roots back to the 1950's.

� Near-exact copies of the 2824-2 are produced by Sellita (the SW200) in Switzerland and by Hangzhou (the 6300), Sea-Gull (the ST21) and Shanghai Watch Factory (designation unknown) in China. The Valanvron watch company in Switzerland assemble and finish ST21 ebauches as legally 'Swiss Made' movements, designated Valanvron 24. wus

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� Near-exact copies of the 2836-2 are the Swiss Sellita SW220, Chinese Hangzhou 6311 and a Sea-Gull ST21 variant. The Valanvron 36 is based on a Sea-Gull ebauche.

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ETA 2892.A2 - ETA's more upscale 2892 is an automatic winding, twenty-one (21) jewel movement fitted with top quality components, with its design dating to the 1970's. Owing to it's relatively slim height of 3.60mm, the 2892.A2 provides a good platform on which to add or build a chronograph complication.

� The Sea-Gull ST18 is a near copy of the 2892. Valanvron assemble and finish ST18 ebauches as Swiss Made movements, designated Valanvron 92.

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Valjoux 7750 - The ETA/Valjoux 7750 is a widely used automatic winding, twenty-five (25) jewel chronograph movement, which can be fitted with a variety of features including the triple date (day, date, month and moon phase) or a variety of two and three register models with totalizers or counters for minutes, seconds and hours.

� Various Chinese clones of the 7750 are manufactured by the Liaoning Watch Factory and the Shanghai Watch Factory. Non-Chinese clones include the Swiss Sellita SW500 and Russian Maktime 30664.

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Unitas 6497-1 - The ETA/Unitas 6497 is a large, manual winding, seventeen (17) jewel movement, often fitted with a subsidiary (small) seconds complication in the 9 o'clock position. Originally intended for pocket watches, the 6497 has seen a recent resurgence in popularity due to its association with Officine Panerai wristwatches and homages.
� Hangzhou's 9000 series is a near copy of an earlier version of the 6497/6498, whereas the Sea-Gull ST36 is closer to the current ETA version. Both Hangzhou and Sea-Gull versions are available in skeleton versions that stylistically differ from the ETA version.

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Venus 175 - A hand-winding movement with column-wheel controlled chronograph with 30 minute totalizer, no hour totalizer. Production ceased in the early 1960s.

� Strictly speaking, the Sea-Gull ST19 is not a 'clone' of the Venus 175, as it is descended directly from a movement built on the same tool-set as the original Venus, transfered to the Tianjin Watch Factory in the 1960s for production of a watch exclusively for the Chinese air force. This ancient design was resurrected in the 21st century, and subtly but extensively upgraded to become the ST19. Due to its use in fake Omega Speedmasters, it is occasionally (and very incorrectly) referred to as a 'Lemania clone'.

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Miyota 8205/8215 - The Japanese made Citizen/Miyota 8205/8215 and 82S and 8N series variants are among the most popular off-the-shelf automatic movements used worldwide by OEM and proprietory watch manufacturers due to their robust nature and low cost. These movements are able to hand wind, but auto-wind in only one direction and lack a hacking (seconds stopping) function. The escapement beats at 21,600bph (6 beats per second).


� Chinese-made clones include the Dixmont Guangzhou DG28/38 series and near identical Nanning NN28/38 series. In their basic form these movements exactly match the dimensions of the Miyota movement, enabling them to compete directly for some of Miyota's established clients. Their most significant difference from the Miyota is the wide range of functional enhancements available on these movements, which gives the Chinese manufacturers a competitive edge in the marketplace. For example - the ability to offer a watch assembler both a day/date and a GMT complication compatable with the same case dimensions. Unlike the Miyota, the DG and NN movements have a hacking function. Fujitime is an example of a watch company that has switched from Miyota 8205/8215 to DG28. The DG/NN design may be visually distinguished from the Miyota by a stepped top plate with prominently chamfered holes for the jewels on the edge of the step.

[george_]

The Sea-Gull ST16 is also greatly influenced by the Miyota design, but with significant differences in the auto-winding mechanism, which is based on the Seiko system. Like the DG and NN movements, the basic ST16 is also dimensionally compatible with the Miyota, but also hacks. The revised ST17 positions the 4th wheel at 6 o'clock to better suit a seconds sub-dial, while retaining the Miyota dimensions. Both the ST16 and ST17 have a separate plate for the auto-winding module, making them easy to distinguish from a Miyota movement.


The excellent reputation of Miyota automatic movements has led to some on-line sellers claiming a 'Miyota' movement in watches using the DG or NN movements. The Croton watch company even goes so far as to designate the the DG28 used in their watches as 'Japanese CR8215 movement' and their sellers claim it is a 'modified Miyota'. The rotor is marked 'Japan', even though the DG logo is clearly visible below the balance wheel. Similarly, their day/date 'Japanese CR8205 movement' is in fact the Sea-Gull ST16.

[george_]

� Hangzhou's 2000 series of movements are based on the Seiko 7009. Hangzhou offers many complications for this movement series, most of which were never available from Seiko. The use of these movements in some counterfeit Seiko watches has led some to claim these movements were designed specifically for that purpose. However, given the costs associated with designing and tooling up for production of an all new movement, and the many un-Seiko-like enhancements also offered, it is far more likely that the movement was created for more general use, but its similar appearance to the Seiko 7s26 makes it attractive to fakers.

[george_]

A clone of unknown origin enjoys extensive use at the budget end of the market, especially short-lived brands from Shenzhen. An early client for this movement was Orion, Moscow. The Orient-clone is available in solid or skeleton, with date, day/date and day/date/24-hour options. The plates are often decorated with an etched and polished stripe pattern. Quality is generally lower than the Hangzhou 2000. Some sources state a Shanghai origin for these movements, and Golden Time seem likely, but firm evidence is lacking. Some on-line parts catalogues list these movements with the prefix 'SP'

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