A man in his 20s sustained an injury to their hand following the assault, which took place at a fast-food restaurant in The Mall on 21 May 2021.
Officers have spoken with several witnesses and reviewed video footage of the incident. As a result of these enquiries, they are now able to release the image.
Anyone who can identify the man is asked to call Kent Police on 01622 604100 quoting 46/86585/21.
You can also call the independent charity Crimestoppers anonymously on 0800 555111 or complete the online form at www.crimestoppers-uk.org.
