The Acqua Perpetual is the first perpetual calendar dive watch, and models from the Archive collection are not being produced anymore. Self-winding UN-33 caliber movement patented by Ulysse Nardin. Features displays for weekday, date, month and year. Stainless steel case and bezel. Unidirectional rotating bezel, sapphire glass. Rubber strap with titanium elements and deployment clasp. White dial with luminous hands and markers. Original box and papers, box does show signs of wear. Pictures are of actual watch being offered.