The victim, a man in his 30s, was waiting at a bus stop in Pelham Road on Wednesday 14 July 2021 between 6pm and 7pm, when a man he did not know approached him.
The offender is alleged to have used a weapon to threaten the victim before they stole his wallet.
The suspect is described as wearing a black hooded top with the hood up and a facemask. He was also wearing black gloves.
Anyone who witnessed the incident or who has dash cam or mobile phone footage that may assist the investigation is asked to call Kent Police on 01634 366149, quoting reference number
You can also contact the independent charity Crimestoppers anonymously by calling 0800 555111 or using the anonymous online form available via this link: https://crimestoppers-uk.org