The Classic Power Reserve Big Date Manufacture is housed in a 40mm case and is equipped with the FC-735 Manufacture caliber that boasts three complications: power reserve, big date and moonphase. Features:Moonphase, Hours, Minutes, Big Date, Power Reserve, Seconds Specifications:Movement: Automatic FC-735Movement Technology: AutomaticMovement Description: Powered by the release of a wound spring, mechanical movements never require a battery. Automatic mechanical movements have an oscillating weight that winds the spring with the motion of the wearer’s arm. Case:Material: Stainless SteelColor: Silver-ToneShape: RoundDiameter: 40 mmThickness: 12.19 mmLug Width: 20 mmWater Resistance: WR50 / 5 Bar / 166 ft [Still Water Swimming]Crystal: Anti-Reflective Sapphire CrystalCrystal Description: Impact and shatter resistant; anti-reflective coating deflects light Dial:Color: NavyMaterial: BrassFeatures: Indices, Luminous Hands, Moonphase, Power Reserve IndicatorAccent: Silver-Tone Strap:Material: Alligator LeatherColor: BlueType: StrapClasp: Folding buckle with push buttons