ItemLongines Men's WatchModel #L4.815.4.92.2CollectionFlagship HeritageCaseStainless SteelCase BackScrew-Down Stainless SteelBezelFixed Stainless SteelDial ColorBlue SunrayDial FeaturesApplied Indexes / Swiss Super-LumiNova / Silvered Polished Hands / Moonphase / Date Display at 6:00ClaspPin BuckleStrap ColorBlueStrap MaterialAlligator Strap (19 mm Strap Width / 7.5 inches Strap Length)MovementSelf-winding mechanical movement beating at 25'200 vibrations per hour, with a monocrystalline silicon balance-spring power reserve up to 72 hours / L899Case Width38.50 mm (Case Thickness 12.40 mm)Water-Resistant30 metersCrystalScratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides