P.O.Box 440 , Post Code 114 Muscat , Khalili Building (Above Grill Houses), Omar Khayyam Restaurant, 3rd Floor, Al Khuwair ( Muscat ) Sultanate of OmanP.O.Box 440 Post Code 114 Muscat Location Khalili Building (Above Grill Houses), Omar Khayyam Restaurant, 3rd Floor, Al Khuwair ( Muscat )