Bayswater police are seeking information about an assault in Mt Lawley on Tuesday, November 6.
At 7.30pm, two men were sitting at a bus stop outside a bar on Beaufort Street when a man not known to them approached and handed one of the men a watch.
As the victim looked at the watch, the man punched him several times in the head before running away from the scene.
The victim, a man in his 30s, was rendered unconscious and taken by ambulance to Royal Perth Hospital for treatment.
Police would like to speak with anyone who saw the incident and they would particularly like to speak with the man pictured below left.
Anyone with information is urged to call Crime Stoppers.