Before slotting the movement into its Black Bay Chrono, Tudor supplies Breitling with a few replacement components — a tungsten winding rotor, a variable inertia balance wheel, a silicon balance spring, and the axis. Breitling then modifies the movement by replacing the B01’s 30-minute sub-dial with the Black Bay Chrono’s 45-minute chronograph register.
The movement is then “decorated” in the typically industrial Tudor style. The combination of sandblasting, brushing, and laser engraving adds up to a more straightforward finishing than Breitling’s more finessed style for its movements.