Series BEAR GRYLLS SURVIVAL 3720 SEA SERIES Model 3723 Movement (technology) Quartz Size of case diameter 42.00 mm Case Material CARBONOX Case Bezel Uni-directional rotating Crystal/Glass material Hardened Mineral Crystal Strap/Bracelet material Orange genuine rubber strap Water resistance (m/ft/atm) 200 / 660 / 20 Case Height 14mm Weight 76g Illumination Luminox self-powered illumination, constant glow for up to 25 years in any light condition