Police were contacted at 13:00hrs on Thursday, 1 July following a third party report of an unprovoked assault on Whistler Street, N5.
The victim, a 25-year-old man, was reported to have been walking in the street when he was approached by a man and punched in the face without warning. The suspect then left the scene.
Officers spoke to the victim over the phone following the incident. He had suffered a facial injury.
There have been no arrests.
They would like to speak to the man pictured and are asking anyone who can identify him to tweet @MetCC or call 101 reference CAD 2818/06Aug21.
To remain 100% anonymous, contact the independent charity Crimestoppers on 0800 555 111.