Constructed of solid marine grade 316L stainless steel, this tactical grade Ballast Amphion watch features two subdials and with a 3 o' clock date calendar. Armed with an automatic movement, this watch features a screw-down crown. Case: Solid marine grade 316L stainless steel with IP black or gun metal plating Caseback: Stainless steel, snap-down Bezel: Solid marine grade 316L