| Brand: | Sea-Gull, Tianjin | 
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| Family: | ||
| Height: | 5.05 mm | |
| Jewels: | 26 | |
| Reserve: | 41 hours | |
| Frequency: | 28800 A/h | |
| Winding: | Automatic, Bi-Directional Automatic Winding | |
| Diameter: | 25.60 mm ( ligne) | |
| Complications: | Date, Day, Hacking Seconds, Hand Winding, Instant Date Change, Instant Day Change, Quick Date Correction, Quick Day Correction | |
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 3:00 | |
| Production: 2005 – Current | |||||||||||
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| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. ST2100, produced by Tianjin Seagull Corporation, is an automatic movement with a central day and date wheels. The design is similar to the ETA 2836-2.