The hooded raider – who was today being hunted by police – escaped with £815 from the till.
And detectives investigating the raid on the shop on High Street, Mosborough, have issued the robber’s image from a closed-circuit TV camera in the store, in the hope someone may recognise the offender and be able to name him.
The thug was white, around 5ft 10ins tall, and slim.
He was wearing a dark grey Adidas hooded top, a woollen hat, black jogging bottoms and dark gloves.
Police, who are scouring CCTV footage and have carried out door-to-door inquiries, say that after the robbery the gunman made his getaway in a dark coloured Audi.
A South Yorkshire Police spokeswoman said: “A man wearing dark clothing entered the off-licence armed with a handgun, and made demands for the contents of the till.
“He left the store with £815 and officers believe he made his escape in a dark coloured Audi.”
Anyone with information about the culprit - or witnesses to the raid at 9.20pm on Monday, October 14 - should call South Yorkshire Police on 101 quoting incident 1,172 of October 14.
Crimestoppers can also be contacted anonymously on 0800 555 111.