Police are appealing for information on the suspect featured in this CCTV footage.
The footage shows a burglary at Stuart Porter Antiques in Broad Street, Stamford, on August 29 last year.
Despite extensive enquiries officers have been unable to make an arrest or recover jewellery stolen during the raid, which is worth an estimated £20,000.
Officers are appealing for anyone who may have any information on the crime, the pictured suspect, or the pictured jewellery to get in touch with them as soon as possible.
The offender broke into the building through a window at the back, sometime between 5.30pm on August 29 and 3.40am on August 30. The jewellery was taken from a glass cabinet inside.
Anyone with any information can call T/DC Keith Roberts at Grantham CID via the non emergency 101 number, or call independent charity Crimestoppers anonymously on: 0800 555 111.