Notwithstanding any other City ordinance, code or regulation to the contrary, it shall be unlawful for the permittee of such business to erect, construct, or maintain any sign for such business other than one (1) primary sign, which shall be attached to the face of the building. Such sign shall not contain any flashing or moving lights and shall be a flat sign not exceeding seventy-five (75) square feet in area and shall contain no photographs, silhouettes, drawings, or pictorial representations in any manner and may only contain the name of the business.