A 79-year-old woman was duped out of £200 after a man, claiming to be a builder called Jonathan, visited her home in Attwoods Drove, Compton, and offered to carry out construction work.
The woman gave him the money but he failed to return.
He is described as white, between 32-33-years-old, about 5ft 7ins, of athletic build with brown eyes, a plump face, gaps between his teeth and fresh cuts over his left eye.
He was wearing a grey or navy fleece jumper and a hi-vis jacket. He also spoke very slowly.
PC Cassandra Hakin said: “This is a horrible crime where an elderly woman has been tricked into handing over money.
“If you have seen anyone suspicious in the area, or had someone cold calling at your door, contact the police. Genuine companies will not call at your home offering to complete work without a prior appointment.
“Do not buy goods or services on the doorstep and if the caller does not leave, then call the police.”
Anyone with information should contact PC Hakin at Winchester police station on 101 or call Crimestoppers anonymously on 0800 555111.