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The incident occurred at around 1.30pm on Friday, December 3, at Subway on Stonehills.
A man walks into the staff only area on the first floor of store and removes a Blackberry mobile phone. He returns to the ground floor and joins a second man before walking out of the shop, turning right on to Howards Gate.
Officers would like to speak with the men pictured in relation to the theft. It may be that they were witnessed to the crime or can offer assistance in the investigation.
If you recognise this person or have any information about the incident please call PC Gavin Richardson Hertfordshire Constabulary on 0845 3300 222, quoting crime reference B1/10/3841. Alternatively call Crimestoppers, the independent charity, anonymously on 0800 555111. You do not have to give your name and you could be entitled to a cash reward.