Police are appealing for information after cash stolen from a 36-year-old man Lincoln man on September 27 along Deacon Road.
Some time between 10.30pm and 10.45pm, the offender was on a bicycle and threatened the man with a knife or screwdriver, demanding money.
The offender also stole the man’s mobile phone and a set of keys. No-one was hurt.
The man has been described as white, around 22 and 25-years-old, slim build and tall. He wore a grey hooded top and white cap.
Anoyone with information should call Lincolnshire Police on 0300 111 0300 or Crimestoppers anonymously on 0800 555 111.