the Genius Hommage Collection Roma watch is a tribute to the watchmaking art of gérald Genta, combining iconic elements of the Royal Oak and Nautilus in a distinctive design. Key Features. Reference: GH1-003000-bk-00-95 Movement: Available in two versions: Automatic Swiss Made Genius Power 100 with date function and power reserve of approximately 100 hours Quartz Case: 316L stainless steel Dimensions: 39 x 49.8 x 10.6 mm (automatic version), 40 mm diameter (quartz version) Glass: Flat sapphire with anti-reflective coating and silvered edge Dial: Black with luminescent indexes and hands treated with Super-LumiNova Bracelet: 316L stainless steel with brushed and polished finish; 24.8mm lug width; 10.8mm butterfly folding clasp Water resistance: 5 atm (50 meters)