The Museum of East Dorset in High Street Wimborne has been robbed with a Screen projector worth £500 taken.
The incident happened at around 3.45pm on Monday 4 December 2023 when a man entered an office area and made off with the item.
Police Community Support Investigator Steven Willis, of Dorset Police, said: “We are continuing to investigate this burglary and I am issuing CCTV images of a man we would like to identify as part of our enquiries.
“While I appreciate that you cannot see his face, I am hoping that someone may be able to identify him from his distinctive clothing.
“I would urge anyone with information regarding his identity to please contact us.”
Anyone with information is asked to contact Dorset Police at www.dorset.police.uk or by calling 101, quoting occurrence number 55230195456. Alternatively, independent charity Crimestoppers can be contacted anonymously online at Crimestoppers-uk.org or by calling Freephone 0800 555 111.