Jewellery and watches were stolen during two linked burglaries in Welwyn.
The break-ins occurred at around 3.15pm on October 8 and 7.10pm the evening before at Tewin Water House.
The stolen items are said to hold significant sentimental value.
Police are releasing images of a person who may have information about the incidents.
Officers said: "Officers are releasing the images because the person pictured is believed to have been in the area at the time and may have information to assist the investigation."
If this is you, or you recognise this person, please email Investigator Linda Bunton via Linda.Bunton@herts.police.uk.
You can report information online at herts.police.uk/report, via online web chat at herts.police.uk/contact, or by calling the non-emergency number 101, quoting 41/97518/26.
Alternatively, contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.
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