STAMPS OF PRIVATE POST
For the handling of correspondence into towns, as in difficult historic periods, they operated private posts, with their own stamps. As log as they had the acceptance and accreditation of the official postal authorities, they can be used for the support of the thematic information.
Italian society known as "SABE" (initials of the "Societa Anomima Barbera Editore")
German private stamps of various towns
Russian stamps of private poet, known as "Zemstvos"