Permits for special canceling or postmarking dies

§ 2508. Permits for special canceling or postmarking dies (a) In post offices of the first and second class the Postmaster General may permit, for a period of six months and the duration of the event to be advertised, the use of special canceling stamps or post-marking dies for advertising purposes when the event to be advertised— (1) is for a national purpose for which Congress has made an appropriation; or 74 Stat. 607 (2) is of general public interest and importance and is to endure for a definite period of time and is not to be conducted for private gain or profit. (b) The permittee shall prepay all expenses for the purchase, adapting or installing special canceling stamps or postmarking dies. (c) The Postmaster General may revoke permits granted under this section when he finds it expedient or necessary to use special canceling stamps or postmarking dies for governmental purposes.