Features Chronograph Chronometer See-through case back Small seconds Tachymeter Master Chronometer certification Ultra-high magnetic resistance movement Reference number 310.23.42.50.99.001 Size Between Lugs Open Case Measurement Modal 20 mm Length Including Lugs Open Case Measurement Modal 47.50 mm Thickness Open Case Measurement Modal 13.18 mm Case Diameter Open Case Measurement Modal 42 mm Case Steel - Sedna Gold Dial Color Pink Crystal Windshield Hardened sapphire crystal with anti-reflective treatment on the inside Water Resistance 5 bar (50 meters / 165 feet) Approximate Product Total Weight 96 g Caliber Omega 3861 Movement Hand-wound Power Reserve 50 hours Strap Color Black Strap Type Alligator Strap Surface Alligator leather Strap Backing Calf leather Buckle Type Folding clasp Buckle Material Stainless steel