Stainless steel case with a blue leather strap. Bidirectional stainless steel bezel showing slide rule markings. Blue dial with luminous hands and index hour markers. Minute markers. 24 hour markers. Tachymeter scale appears around the outer rim. Dial Type: Analog. Luminescent hands and markers. Date display appears at the 3 o'clock position. Chronograph - three sub-dials displaying: 12 hours, 30 minutes and 60 seconds. Automatic movement with a 42-hour power reserve. Scratch resistant sapphire crystal. Non screw-locked crown with two gaskets. Solid case back. Case diameter: 46 mm. Case thickness: 15.50 mm. Band width: 24 mm. Tang clasp. Water resistant at 30 meters (100 feet. Functions: hours, minutes, seconds, calendar, chronograph, tachymeter. Dress watch style. Watch label: Swiss Made. Additional Information: the "Slide Rule" aka "Navigation Computer". The Slide-Rule complication can compute different airborne calculations such as fuel consumption, climbing times & converting miles into nautical miles or kilometers. Breitling Navitimer World Blue Dial Chronograph Men's Watch A2432212-C651BLLT.