Cal. ST3600 (also called ST36), 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.
Like most Tianjin Seagull movements, it is inexpensive and finishing is focused on visible components. As of 2022, the retail price for Cal. ST36 was just US$53.99. It is rumored that some Swiss movement makers use various Sea-Gull movements as a base, including this one.
