7 C.F.R. § 800.161
(c) Required information. Each official certificate shall show the following information in accordance with the instructions:
(2) Letterhead. Information and statements requested by the applicant but not required by the regulations or instructions may be shown on letterhead stationary of the Service or an agency when (i) ample space is not available for reporting the information or statements on the certificate, (ii) letterhead stationary is determined to be more suitable than the official certificate, and (iii) the certificate is referenced on the letterhead stationary and distributed according to § 800.160. Letterhead stationary of the Service shall be used for all export grain.
(Approved by the Office of Management and Budget under control number 0580-0011)