Police have released a CCTV image of a man after more than £300 was stolen from a bank in Radlett.
Between 11.45am and noon on Thursday, June 6, in NatWest, in Watling Street, the offender asked that a large amount of money be changed into different denominations more than once.
It was later found that more than £300 had been taken.
Hertfordshire Constabulary would like to speak with the man pictured as he may have information about the incident.
Anyone with information on his identity is asked to contact Assistant Investigator Charlotte Hartley on 101, quoting crime reference number J1/14/1779 or call Crimestoppers anonymously on 0800 555 111. A reward could be available.