Italian army postal service Upper Silesia 5 Pfg green vertical pair, 15 Pfg dark gray violet vertical pair, 20 Pfg blue, 30 Pfg yellowish orange vertical pair postage stamps issue ironworks and peace pigeon 1920 on cover from Opole to Napoli, ZKr Opole 16.7.1920 (237.8), 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