Keywords: Canalzoneprecancel1928.jpg Precancels of Cristobal the U S A Panama Canal zone 1928 П едва ительные гашения К истобаля Зона Панамского канала США 1928 год own collection United States Post Office Department 1928; uploaded 2008-05-30 PD-USGov Overprints on stamps of the United States 1928 stamps Stamps of the Canal Zone Canal Zone Precancel stamps People of the United States on stamps |