Two masked men threatened a member of staff at a bookies with a knife before escaping with cash.
Police are appealing for witnesses to the robbery at the Betfred store in High Street, Mansfield Woodhouse, at around 9.50pm on Wednesday August 2.
The men were described as white and were dressed in dark clothing with scarves over their faces and hoods up. They fled on foot toward Parkers Lane. The member of staff was unhurt.
A spokesman for Betfred said: “The safety of our staff and customers is paramount and we are working with the Police.”
Anyone who witnesses the robbery, or has any information, is urged to contact Nottinghamshire Police on 101, quoting incident number 904 of 2 August. Alternatively, call Crimestoppers anonymously on 0800 555 111.