Beachgoers found the body lying against a seawall on Somerton Beach in Adelaide on 1 December, 1948.
The man was dressed in a suit and tie, and appeared to be aged in his 40s or 50s.
In his pocket were bus and train tickets, chewing gum, some matches, two combs and a pack of cigarettes. He had no wallet, no cash, and no ID.
The tags on his suit had been cut off, and forensic examiners suspected he had been poisoned.