A Rolex watch worth around £15,000 was stolen from a man as he was walking home from a shop in Barry.
CCTV has been released of a male suspect following an incident near a bus stop close to the rugby club on Merthyr Dyfan Road last month.
Cash was also taken fom the 40 year-old who had been walking home from the Family Shopper store between 7pm and 7.30pm on Friday 28th November.
South Wales Police have described the robbery as "an isolated and unusual incident".
Detective Constable Andy Coakley said: "I would like to reassure the community that we are conducting a thorough investigation. Whilst the CCTV we have sourced is not of the best quality, we believe that somebody who does know the suspect, may recognise him."
The suspect was filmed before the incident running along Morningside Walk from Elizabeth Avenue - atterwards, he was spotted returning up Merthyr Dyfan Road, possibly back onto Morningside Walk.
He is described as tall and slim and was wearing a dark hooded top with a bright white logo on the back, dark jogging bottoms and trainers with a reflective strip around the base.
DC Coakley added: "I believe the suspect would have stood out in the area at this time due to his clothing and demeanour. He was seen on CCTV running to and from where the incident happened."
"We are appealing for anyone with information which might help us identify the suspect and the whereabouts of the stolen watch, estimated to be worth £15,000."
Anyone with information should contact South Wales Police on 101 or via the live web chat, quoting reference no. 2500375490.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.

Vale Councillor blasts school funding in the county
Bear Field Skate Park set for major upgrade as part of new Placemaking Plans
New apprenticeship courses in construction to be introduced in Wales
Former Penarth Bank could become a cafe
New poll shows majority of Welsh voters lack voting confidence ahead of Senedd Election
Construction hub secured for rail upgrades
Prolific thief banned from Holton Road
Cowbridge: plans for more holiday lodges
Man dies suddenly in Romilly Park
Cash boost for Sully Primary School
Speed limits reduced despite objections
Concern over imported chicken in school meals
A48 closed after three-vehicle collision
Rhys unveils red bench 'in living memory'
Barry: plans lodged for 70-home development
Plans to revamp Heritage Coast centre
Carnival drummers join pirate opera encore