ST19
ST19 is an automatic or manual wind column wheel chronograph movement produced by Sea-Gull .
History
When the Chinese government first commissioned a chronograph watch for pilots in the People's Liberation Army Air Force in 1961, the development contract was awarded to the Tianjin Sea-Gull Watch Company, and was code-named Project 304. Sea-Gull based their first chronograph movement, the ST3 , on the Swiss-made Venus 175 movement. Whereas the Swiss movement had 17 jewels, the Chinese movement has been developed further as the ST19 movement, with 21,600 bph, automatic versions and 19, 21, 22 or even 23 jewels.
Variants
- ST1901: 2 register, small seconds at 9, 30 min counter at 3
- ST1902: 3 register, small seconds at 9, 30 min counter at 3, 12 h register at 6 that mirrors the time-keeping hour hand
- ST1903: 3 register, small seconds at 9, 30 min counter at 3, 24 h register at 6 that is not affiliated with the chronograph function
- ST1904: unused model number, possibly being reserved for an automatic winding or true 3 register chronograph version
- ST1905: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 4:30
- ST1906: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 6
- ST1907: 2 register, small seconds at 9, 30 min counter at 3, central power reserve indicator
- ST1908: 4 register, small seconds at 9, 30 min counter at 3, date at 12, real moon phase at
- ST1940: 2 register, small seconds at 9, 30 min counter at 3, automatic
Specifications
- Features: manual-wind chronograph, 60s, 30min, column wheel, sub second
- Diameter: 13.75 ligne, Dm=31.0mm, Do=31.3mm
- Height: 5.85mm (dial plate +0.4mm)
- Mounting height: 0.5mm
- Stem height: 1.8mm
- Jewels: 19 or more
- Frequency: 21.600 bph
- Power reserve: 51h
- Hands: 1.40 x 0.95 x 0.28 / 0.29 x 0.25mm
