The man walked off with the takings from sales of a photography book at the Greyhound in Whitchurch.
He told landlord Richard North that he was a friend of the author, parish councillor Jim Donohue, and had been asked by him to pick up the money.
He said Mr Donohue was unable to collect it in person because he was having a foot operation.
Mr North only realised he had been tricked when Mr Donohue visited to collect his takings.
He said: “When I asked how his foot was, he said there hadn’t been anything wrong with it. I told him about what had happened and he said, ‘I think you’ve been had’. I felt like such a lemon.”
Mr Donohue said: “I hadn’t been into the pub for a while — the conman must have seen the flyer for my book in the porch and decided to take a chance. I’m not particular ly upset — it’s more funny than anything else.”
The theft, which happened last month, has not been reported to police. The thief was white, about 5ft 9in and in his late forties or early fifties with greying black hair and black-framed glasses.