The Breitling Sextant (Ref. B55045/D55045) is a luxury chronograph watch from the 1990s, notable for its unique MecaQuartz movement that combines quartz timekeeping with a mechanical chronograph module. The specific configuration you mentioned features a two-tone design with an 18k yellow gold bezel and riders on a stainless steel case, paired with a classic white dial.

• Movement: Powered by the Frederic Piguet Caliber 1270 (Breitling B55), a "MecaQuartz" movement where the chronograph seconds hand sweeps smoothly at 1/5 second intervals, similar to a mechanical watch.

• Case: 36mm stainless steel case (often cited up to 38mm including the crown) with a thickness of approximately 10.5mm.

• Bezel: Unidirectional rotating stainless steel bezel featuring four 18k yellow gold riders (tabs) at the 15, 30, 45, and 60-minute marks.

• Dial: White dial with three recessed sub-dials, applied gold-tone baton markers, and a date window positioned between 4 and 5 o'clock.

• Crystal: Scratch-resistant sapphire crystal, often featuring an anti-glare coating.

• Water Resistance: Typically rated at 100 meters (10 ATM), featuring a screw-down crown and case back.