North Yorkshire Police were called at around 10.10am on Wednesday 18 April 2012 after reports that a cash delivery man had been robbed on Front Street in Acomb.
The man was assaulted by men wearing balaclavas who stole a cash box containing a sum of money before leaving the scene in a car.
It is believed the vehicle made off in the direction of Carr Lane.
The cash delivery man has been taken to York District Hospital for treatment to a head injury sustained in the incident.
Officers are appealing to anyone who witnessed the robbery to get in touch.
Detective Sergeant Mandy Grundy, of York CID, said:
“Clearly we need to identify who was responsible for this incident as soon as possible.
“There will have been numerous people on Front Street at the time of the robbery and I urge anyone who witnessed the incident or knows who the suspects are to contact the police or Crimestoppers as soon as they can.”
Anyone who can help officers with their enquiries is urged to contact York CID on 101.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111, quoting reference number NYP-18042012-0103.