|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|
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.