| Brand: | Sea-Gull, Tianjin | 
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| Family: | ||
| Height: | 7.4 mm | |
| Jewels: | 29 | |
| Reserve: | 45 hours | |
| Frequency: | 21600 A/h | |
| Winding: | Automatic | |
| Diameter: | 30.40 mm ( ligne) | |
| Complications: | Date, Day, Month, Year | |
| Hands: | Central Hour Hand, Central Minute Hand, Date Pointer at 3:00, Day Pointer at 9:00, Month Window at 12:30, Open Heart at 6:00, Year Window at 11:30 | |
| Production: – Current | |||||||||||
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| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. ST2503 is a watch movement produced by Tianjin Seagull in China. It is part of the TY2500/ST25 family of movements.