|Diameter:||mm ( ligne)|
|Hands:||Central Hour Hand, Central Minute Hand, Small Seconds Hand at 6:00|
|Production: – Current|
Cal. ST3621, produced by Tianjin Seagull Corporation, is a hand-winding movement with small seconds based on the Peseux 7001. Tianjin added a long pointer to indicate “SLOW” or “FAST”.