Police are investigating after three men burst in on an elderly couple at their home in Hamilton Close, Worthing, as they were watching television together at 8.15pm on Saturday 30 September.
The couple were kept in their living room while other rooms were searched. When the men left, cash and jewellery - the latter of particular sentimental value - were found to have been stolen. The couple, in their 70s, were shaken but unhurt.
All the intruders were described as white, in their mid-20s, all clean shaven, all with short brown hair and around 5' 9"/5' 10" tall. One had blue eyes and was wearing a baseball cap and grey anorak. A second was also wearing a baseball cap, bearing an NYC logo, and a dark scarf covering the lower part of his face.
The third man wore a red and yellow mask or scarf over his face and was carrying a large Stanley screwdriver with a yellow and black handle.
Detective Constable Jo Duncan, of Worthing Investigations, said: "Officers searched the area and carried out house-to-house enquiries. Although this is thought to have been an isolated incident, patrols are continuing."
Anyone who saw or heard anything suspicious in the area on Saturday evening, or who may have other information of help to detectives, is asked to report details online or to phone 101, quoting serial 1241 of 30/09.
Alternatively please visit the Crimestoppers website or contact the independent charity anonymously on 0800 555 111.