The Breitling Navitimer 1 B01 Chronograph 46, ref. AB0127211C1P1, is the large-format expression of Breitling's in-house B01 Navitimer line, introduced as part of the Navitimer 1 collection that brought manufacture movements to the iconic pilot's tool watch. The 46mm stainless steel case carries the Navitimer's signature bidirectional rotating sliderule bezel — confirmed in the photos with its deeply knurled edge and multi-scale slide rule ring calibrated for BASE, MPH, KM, NAUT, and STAT calculations. The dial is blue, with a contrasting white chapter ring and three white subdials at the traditional tri-compax positions. A red central seconds hand and red accent at the 12 o'clock sliderule marker are clearly visible. The dial is signed "Breitling Chronometer Navitimer," confirming COSC chronometer certification. Baton indices and applied hour markers populate the blue field, with a date window at approximately 4 o'clock. The exhibition caseback — visible in the photos — is engraved "Certifié Chronomètre Manufacture en Suisse Testé 3 Bars" and "AB0127," and displays the Breitling Caliber B01 automatic movement through a sapphire window. The column-wheel mechanism is visible through the caseback. Functions include hours, minutes, small seconds, date, and column-wheel chronograph. Power reserve is 70 hours. The watch is fitted on a black leather strap with white contrast stitching. Excellent condition with Breitling box, papers dated 2021, and travel case.