The Breitling Navitimer B01 Chronograph 46 AB0137 is a legendary pilot’s chronograph that pays homage to the brand’s rich aviation heritage through its iconic design and precision engineering, featuring a robust 46mm stainless steel case with an impressive 14.52mm thickness and a distinctive bidirectional rotating bezel with a circular slide rule that remains the most recognizable feature of the Navitimer line . This exceptional timepiece showcases a deep black dial that offers a striking contrast to its applied silver-toned indices and hands, all filled with luminous material for excellent legibility, complemented by the classic three chronograph sub-dials positioned at 3, 6, and 9 o’clock for measuring 30 minutes, 12 hours, and running seconds, along with a practical date window at 6 o’clock . At the heart of this watch beats the prestigious in-house Breitling Caliber B01, a COSC-certified chronometer movement renowned for its robustness and precision, offering an exceptional 70-hour power reserve with 47 jewels and a frequency of 28,800 vibrations per hour, visible through the transparent sapphire caseback that showcases the movement’s exquisite finishing . The watch is secured on a luxurious black leather strap that complements the sporty yet refined character, fitted with a folding deployant buckle for comfortable and secure wear, while the double-sided anti-reflective curved sapphire crystal ensures optimal dial clarity and protection against daily wear . With 3 bar (30 meters) water resistance and a pusher-operated chronograph function, this Navitimer B01 Chronograph 46 perfectly balances the needs of aviation enthusiasts and watch connoisseurs alike, offering a timeless design that has remained largely unchanged since its 1952 debut, making it a true icon in the world of Swiss watchmaking . Key specifications: 46mm stainless steel case; black dial with luminous hour markers and hands; Breitling Caliber B01 automatic movement; 70-hour power reserve; black leather strap with steel folding clasp; chronograph and date functions; circular slide rule bezel; 3 ATM water resistance; sapphire crystal front and exhibition back.