Neither tail number nor MSN were visible on the the aircraft in 91st anniversary colors of the state of Saudi Arabia. Two ground crew members independently of each other told me it was #311.

Registration was painted over on this bird, when I had asked the ground crew they were reluctant to hand out the registration. This aircraft is carrying the Saudi National Day scheme, a very special aircraft that had made its debut display EVER at the Bahrain Airshow. (Registration and c/n confirmed from Photo ID: 519604.)