The Breitling Chronomat B01 42 ref. UB2010121B1S1 represents the modern evolution of one of Breitling’s most iconic sport chronographs. Crafted in stainless steel with platinum bezel rider tabs, the 42mm case balances robustness with luxury. The black dial features applied indices, contrasting chronograph registers, and a date window, delivering excellent legibility. Inside beats the in-house Breitling Manufacture Caliber 01, an automatic chronograph movement with COSC certification and a 70-hour power reserve. Paired with Breitling’s signature Rouleaux rubber strap, this reference offers comfort, performance, and strong market demand among collectors.