PREMIER B15 DUOGRAPH 42
Its function is the simultaneous measurement of two time intervals (split/split times), which is displayed by two hands on the central chronograph. The Duograph is powered by the Breitling-manufactured, COSC-certified, hand-wound Calibre B15. It features two patented innovations: one to simplify the mechanism and the other to improve its precision.
Hours, minutes, seconds, chronograph