Blancpain 1315

Caliber 1315 is an automatic movement manufactured by Blancpain, introduced in 2007 and still in production. It features a 120-hour power reserve delivered through three barrels. The movement uses a silicon balance spring and a Glucydur free-sprung balance with gold regulation screws, paired with an 18K gold rotor. It is an in-house caliber designed for the Fifty Fathoms dive watch collection.