Breitling Bentley Motors 6.75 Speed Watches. 48.7mm stainless steel case, special decorated back, screw-locked crown, rotating pinion bezel with variable tachometer (circular slide rule), cambered sapphire crystal with glareproof treatment on both sides, black dial, selfwinding Breitling Calibre 44B movement with large aperture calendar, chronograph function, stainless steel Speed bracelet. Water resistant to 100 m (330 ft).