Caliber F388B Automatic, Secure Movement,The flyback chronograph, which measures a succession of elapsed times, eliminates many superfluous repetitive operations.Tachometer Two-way rotating 18ct red gold bezel with blue ceramic insert and Super-LumiNova® hour-markers.Dial Color - Blue,Case Material - Red Gold, Water Resistance - 3 bar, Case Diameter - 42.5 mm, Case Thickness - 13.7 mm, Sapphire Back - Yes, Width Between Horns - 22 mm.Strap Type - Leather strap, Strap Clasp -Folding clasp