MOVEMENT Caliber Breitling 17 Movement Self-winding mechanical Power reserve Approx. 38 hrs Vibration 28,800 v.p.h Jewel 25 jewels Calendar Dial aperture CASE Case material Stainless steel Water resistance 300 m (1,000 ft) i Bezel Unidirectional, ratcheted Crown Screw-locked, two gaskets Crystal Cambered sapphire, glareproofed both sides DIMENSIONS Product Weight (Approx.) 114.0 g. Watch-head Weight (Approx.) 91.9 g. Diameter 42.0 mm Thickness 12.1 mm Height (upper lug tip to lower lug tip) 51.2 mm Lug width (in-between lug) 22.0 mm STRAP Strap material Calfskin leather Strap color Blue Strap type Straight Lug 22/20 mm Buckle Material Stainless steel Buckle type Folding clasp Buckle size 20 mm.