Breitling Watch Chronomat 41 AB014012/BA52/378A. Power. Performance. Precision. The Breitling watches Chronomat 41 combines an exceptional fuselage with the selfwinding chronograph Manufacture Caliber 01 motor, chronometer certified by the COSC, as indeed are all Breitling movements. The 41 mm diameter of its sleekly curved case makes it suitable for all wrist sizes. It is equipped with a screw locked crown and pushpieces as well as substantial protective control guards.