|Diameter:||30.40 mm ( ligne)|
|Complications:||Date, Day, Month, Year|
|Hands:||Central Hour Hand, Central Minute Hand, Date Pointer at 3:00, Day Pointer at 9:00, Month Window at 12:30, Open Heart at 6:00, Year Window at 11:30|
|Production: – Current|
Cal. ST2503 is a watch movement produced by Tianjin Seagull in China. It is part of the TY2500/ST25 family of movements.