Italian army postal service Upper Silesia multiple franking 2 Mark dark brown horizontal pair postage stamps issue ironworks and peace pigeon 1920 on cover from Opole to Napoli, ZKr Opole 17.4.1920 (237.8), fragment of an arrival postmark ZKr at back, the letter was, like the by far predominant part the correspondence of the Italian troop contingent in Upper Silesia, of the civil post of the plebiscite area transported, date-appropriate traces of age and usage