No brand or other marking device shall be false or misleading. The letters and figures thereon shall be of such style and type as will make a clear and legible impression. All markings to be applied to products in an official establishment shall be approved prior to use by the Administrator as provided for in Sec. 317.3 of this subchapter, except that official markings prescribed by the Federal meat grading regulations (7 CFR 53.19) need not be submitted to the Administrator for approval.