aquet Droz Chronograph Monopoussoir (Monopusher)Rehaut, Reference: J007634201, 18K White Gold Case on a Strap with an 18K White Gold Buckle, Automatic Movement (Jaquet Droz Caliber 2688M), Hours and Minutes at 12 O'Clock, Subsidiary Seconds at 6, Single Button Chronograph, Steel Blued Hands, Opaline Slate Grey Dial with Guilloch Silvered Subdials, Diameter: 43mm, Thickness: 14mm, Sapphire Crystal, Display Back, Water Resistant to 30 Meters, 40 Hour Power Reserve