Movement Caliber Breitling B25 (Manufacture Concepto) Movement Self-winding mechanical Power Reserve Approx. 48 hrs Chronograph 1/4th second, 30 minutes Vibration 28,800 v.p.h Jewel 32 jewels Calendar Day, date, month & moon-phase Case Case Material 18k red gold Caseback Screwed in (sapphire crystal) Water Resistance 10 bars (100 m/330 ft) Bezel Fixed Crown Non screw-locked, two gaskets Crystal Cambered sapphire, glareproofed both sides Dimensions Diameter 42 mm Thickness 15.35 mm Lug Width (in-between lugs) 22.05 mm Strap Strap Material Alligator leather Strap Colour Brown Strap Type Curved Lug 22/18 mm Buckle Material 18k red gold Buckle Type Folding clasp Buckle Size 18 mm