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Brand: | Sea-Gull, Tianjin | 
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|---|---|---|---|
| Family: | |||
| Height: | 5.05 mm | ||
| Jewels: | 26 | ||
| Reserve: | 41 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding | ||
| Diameter: | 25.60 mm | ||
| 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 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Clockwise Balance Cock  Screw Regulator |
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| Production: 2005 – Current | |||||||||||
| 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.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.