The Breitling Chronomat B01 42. Available in a variety of materials including stainless steel and 18k red gold, the Chronomat features a 42 mm case and the iconic bezel with the four rider tabs. Available with a range of black, blue, silver, and copper dials, the Chronomat is matched to the signature “Rouleaux” bracelet and is powered by the in-house Breitling Manufacture Caliber 01, a COSC-certified chronometer.