| Brand: | Sea-Gull, Tianjin | 
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|---|---|---|
| Family: |
Unknown
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| Height: | 4.50 mm | |
| Jewels: | 17 | |
| Reserve: | 46, 50 hours | |
| Frequency: | 21600 A/h | |
| Winding: | Hand winding | |
| Diameter: | 36.60, 37.20 mm ( ligne) | |
| Complications: | ||
| Hands: | Central Hour Hand, Central Minute Hand, Lépine Small Seconds Hand | |
| Production: 2005 – Current | |||||||||||
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| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. ST3600, produced by Tianjin Seagull Corporation, is a hand-winding movement with Lépine small seconds (at 9:00) similar to the Unitas 6497. It features a classic bridge design and finishing on the back side.