[AIR EXHIBITION in Lviv]. Postal parcel with the commemorative punch of the National Aviation Exhibition in Lviv on d...

[AIREXHIBITION in Lvov]. Postal parcel with an occasional cash register of the National Aviation Exhibition in Lvov, 29 May-29 June 1938.
Board about 1 mm thick, postcard size, being an advertisement of the company "Kopak. Konopacki Brothers. Bridges." The company logo (glider inscribed in a circle) printed in the upper left corner. In the lower part a piece of paper with the typed address of the recipient (Eugene Dovmanovich in Lviv) was pasted over, in the upper right corner a cancelled postage stamp. In the middle part an occasional punch. Good condition.