Three attackers followed the man from Effra Road before knocking him to the ground, attacking him and stealing his Tag Heuer watch.
On September 13, the victim walked from Brixton Road to Leander Road, via Effra Road and Josephine Avenue, before the assault at about 2am.
During the walk, he had removed his watch and put it in his pocket.
The attackers were all men between 18-25.
The first suspect has been described by police as black, 5ft 10ins tall, wearing dark clothing, a baseball cap and a bag across his shoulders.
The second was mixed race, 5ft 7ins tall and was carrying a rucksack.
The third was black and 5ft 10ins tall. He was also described as wearing dark clothing.
The police have asked anyone with information to contact DC Kamran Yaqub at Lambeth Police’s CID via 101 or Crimestoppers anonymously on 0800 555111.