Caliber Breitling 23 Movement Self-winding mechanical Power reserve Approx. 48 hrs Chronograph 1/4th second, 30 minutes, 12 hours Vibration 28,800 v.p.h Calendar Dial aperture CASE Case material Stainless steel Caseback Screwed in Water resistance 10 bars Bezel Bidirectional ratcheted Crown Screw-locked, two gaskets DIMENSIONS Product Weight (Approx.) 108.0 g. Watch-head Weight (Approx.) 85.5 g. Diameter 42.0 mm Thickness 14.7 mm Height (upper lug tip to lower lug tip) 48.0 mm Lug width (in-between lug) 22.0 mm STRAP Strap material Calfskin leather Strap color Brown Strap type Straight Lug 22/18 mm Buckle Material Stainless steel Buckle type Folding clasp Buckle size 18 mm