Omega gents de ville prestige co axial watchsteel yellow gold on steel yellow goldchronometerdatecrystal domed scratch resistant sapphire crystal with anti reflective treatment insidecase steel yellow golddial silverwater resistance 30 m 100 feetsize case diameter 368 mmmovement caliber omega 2500 self winding chronometer co axial escapement movement with rhodium plated finish power reserve 48 hours