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Brand: | Sea-Gull, Tianjin | 
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|---|---|---|---|
| Family: | |||
| Height: | 5.76 mm | ||
| Jewels: | 18, 21 | ||
| Reserve: | 36 hours | ||
| Frequency: | 21600 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding | ||
| Diameter: | 26.00 mm (11.5 ligne) | ||
| Complications: | Date, Hacking Seconds, Hand Winding | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Clockwise Balance Cock  Screwed Mobile Stud Regulator |
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| Production: 1997 – Current | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. ST1612, produced by Tianjin Seagull Corporation, is an automatic movement with a central date wheel. The design is similar to the Miyota 8215 and it uses a bi-directional winding mechanism similar to Seiko’s Magic Lever. The movement is roughly finished by the factory, with no engravings or stampings to identify it.
Cal. ST16 is also known as TY2806 when sold by directly by Tianjin.
Cal. ST1612/TY2806 is used by a number of companies, including Android, Fossil, Hager, Ingersoll, Rotary, and Zodiac. It was the basis for the Claro CL-888, re-manufactured in Switzerland to be sold as Swiss Made.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.