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You are here: Home / Families / Tianjin TY2900/ST19 Family

Tianjin TY2900/ST19 Family

Last Update: June 28, 2019

BRANDS: Sea-Gull, Tianjin

Production: 1963 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
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The Sea-Gull ST19 family is based on the design of the Venus 175 family, which was sold in the early 1960s to the Tianjin Watch Factory after it went out of production. Tianjin upgraded the 17-jewel Cal. 175 to 19 jewels, with the first prototype completed in 1963, a date that has become associated with the movement today. The first test batch was produced for “Project 304”, with an initial run of 1,400 watches delivered in 1966 to the Chinese Air Force.

When Tianjin Seagull Corporation was created in 1992, production of the movement was re-started, with commemorative “Sea-Gull” chronograph watches using the ST19 movement appearing in 2005. Since then, the ST19 family has been expanded and has found favor among budget-minded watch collectors worldwide.

Among the additions in the ST19 is a curious hour hand subdial at 6:00. Unlike most chronograph movements, which show the cumulative measured time on their hour register, this is simply a second timekeeping hour hand. It shows a 12 hour scale on Cal. ST1902 and more useful 24 hour scale on Cal. ST1903.

The ST19 family is also sold by Tianjin as the TY2900 family.

CalibreComplicationsJewelsDiameter
(mm)
Height
(mm)
ST1901
TY2901
Chrono 30 at 3:00
Small seconds at 9:00
19, 21, or 2231.306.25
TY2901SK
ST1901K
Chrono 30 at 3:00
Small seconds at 9:00
2231.305.85
ST1902
TY2902
Chrono 30 at 3:00
12 hour hand at 6:00
Small seconds at 9:00
2231.306.25
ST1903
TY2903
Chrono 30 at 3:00
24 hour hand at 6:00
Small seconds at 9:00
20 or 2231.306.25
ST1905
TY2905
Central Power Reserve
Chrono 30 at 3:00
Small seconds at 9:00
3131.307.25
ST1906
TY2906
Chrono 30 at 3:00
Power reserve at 6:00
Small seconds at 9:00
3131.307.25
ST1907
TY2907
Chrono 30 at 3:00
Power Reserve at 4:30
Chrono 30 at 3:00
Small seconds at 9:00
3131.307.25
ST1908
TY2908
Chrono 30 at 3:00
Moon phase at 6:00
Small seconds at 9:00
Date pointer at 12:00
2231.307.25
ST1931
TY2931
Chrono 30 at 4:00
Small seconds at 8:00
Big date at 12:00
2231.307.45
ST1940
TY2940
Automatic
Chrono 30 at 3:00
Small seconds at 9:00
3331.307.70

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Calibre Start Year End Year Jewels Diameter (mm) Height (mm) Complications
ST1901 19, 21, 22 31.30 6.25 2-Button, Chronograph

ST1901

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