Detective Constable Rachael Gallagher said: "This is the second time the victim had been targeted in this way. The previous incident occurred on January 13 and it is believed the same offender has targeted the elderly victim.
"I would like to speak with this man pictured in the photo about the incident. It may be that he witnessed the crime or can offer assistance in the investigation. If you can help identify him I would urge you to contact me as soon as possible."
Anyone with information about these incidents is asked to call Hertfordshire Constabulary on its 101 non emergency phone number quoting crime reference C4/13/276. Alternatively call Crimestoppers can be contacted anonymously on 0800 555111.
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