Police have reopened investigations into the death of a man found in the River Thames in April 1990.
It is the ninth "cold case" to be reinvestigated by Thames Valley Police in a bid to identify the remains of unknown bodies.
Operation Nightingale began in December and has opened new lines of inquiry across England, Europe and Canada.
The ninth case involves a man, believed to be aged in his 30s, found near Windsor, Berkshire.
An artist's impression of the man, drawn from forensic photographs, shows what he may have looked like when alive.
Winning betting slip
Described as white, about 30 years old, about 6ft tall, with dark-brown curly hair and a thin pencil moustache. He wore a gentleman's wrist watch with a face formed from a US 20 cent coin.
He was also carrying a betting slip for a £10 win on Midnight Court in the 13:15 race at Newbury, issued at 11:05 on 24 February, 1990 at the Clock Tower Betting Office in Duke Street, Brighton.
Police believe he may have known people in Brighton.
When found, he was wearing a BHS grey hooded anorak, a BHS blue jumper, Nico pink sports t-shirt and blue denim jeans.
Thames Valley Police's Major Crime Review Team are conducting Operation Nightingale alongside UK Missing Persons Bureau and Crimestoppers UK.
The nine cases date back to 1970.