Distinguished by its famous circular slide rule which is capable of performing all airborne navigation operations, this Navitimer 1 chronograph is smaller than the original, but no less powerful.At A Glance Black leather strap with white stitching 41mm stainless steel case with a rose gold tone bi-directional ratcheted bezel and 30m water resistance Cambered scratch-resistant sapphire crystal which is glareproofed on both sides Black dial with rose golden baton hour markers Date window at 3 o\'clock Three chronograph sub-dials Circular slide rule Powered by the COSC chronometer certified Breitling Calibre 13 self-winding mechanical movement Minimum power reserve of 48 hours