Movement Caliber Breitling B21 (Manufacture La Joux-Perret) Movement Automatic winding Power reserve Approx. 55 hours chronograph 1/4 second, 60-minute counter Vibrations 28,800 vibrations per hour Number of jewels 30 jewels CASE Case material Ceramic Water resistance 10 atm i Bezel Fixed bezel Crown Non-thread-locking, 2 gaskets Glass Sapphire crystal Size Weight (approx.) 108.0 g. Watch head weight (approx.) 78.2 g. Diameter 44.0 mm Thickness 15.4 mm Height (from top of lug to bottom of lug) 52.8 mm Lug width (between lugs) 22.0 mm Strap/Bracelet Strap Material Calfskin leather Strap Color Brown Strap Type Straight Strap Size 22/18 mm Buckle Material Titanium Buckle Buckle type Buckle Size 18 mm