A man suffered severe scratches and bruises after he was dragged from the door of a stolen car for about half a mile.
The victim, who lives in Harlow in Essex, had arranged to meet a potential buyer of his black Range Rover Sport at a McDonald's restaurant.
The potential buyer was waiting at McDonald's at the Harlow M11 junction just before 7.45pm on Thursday September 20.
He called himself Tony from the Scania company, was about 50 years old with glasses and was wearing a yellow work jacket.
He got into the car which was driven by the owner to the nearby Jet Garage. He then punched the owner and drove off with the owner still hanging on to the door for nearly half a mile.
The victim suffered severe scratches and bruises. The car was later recovered in Rochdale Road, London E17.
Essex Police are appealing for witnesses, or anyone with any information to help them catch the robber.
Anyone with information should contact Pc Michael Ferguson or his colleagues at Harlow Police.