On July 1, shortly after 2pm, a man entered a shop in Forest Gate.
Upon entering the shop, he threatened the owner with a meat clever and swung the blade towards the victim’s face.
Although the blade missed, the man made off with £40 from the till.
Police have described the assailant as of large build and with a circular-shaped tattoo on the inside of his right forearm.
Officers have released a CCTV image from the shop.
Anyone who may know the man’s identity is asked to call police via 101 quoting reference CAD 2607/03Jul or tweet @MetCC.